Apologies for almost a month long wait time. I've been hunkering down on my own comic these past few weeks to the exclusion of all others. Hopefully, I can bang out the last 3-4 of these in the next week or so.
It's good to see that you made progress since first submitting your comic. Yes, there is normally enough to say about a few pages to fill out a meaty review, but the more material the better, obviously, particularly because one of the most important parts of review is identifying patterns. Patterns arise over time and across production. This is more evidence for the obvious--the best way to improve your production is to produce a lot over a long period of time, while self reflecting intermittently.
I'm intrigued by the idea that this is a practice comic, as it has the markings of a relatively long term project. There's a sizable cast, and the premise implies that there is a deep well of mystery surrounding most if not all of them. What do you feel you need to practice? Is it technical skills or discipline? It could be both, obviously, but I think people tend to eventually come to terms with their level of technical skill, regardless of what it is, in the interest of finally getting started. Back to my initial point, it is only through the doing that you can improve. Devoting this project to practice and refinement is a smart move no matter how you slice it.
I'm also interested in what you consider "long." So far, your comic has been ongoing for over three months. That's not a long time, obviously, but all evidence that I can gather from it suggests that there is much more to come. If this project is not complicated and long term, I'm interested to see what your next project looks like.
What strikes me immediately is the neatness of the environments. Specifically, the house interior looks like an IKEA catalog. On the one hand, the polish is easy on the eyes--almost therapeutic, actually. Marie Kondo would be proud. On the other hand, your environments are entirely devoid of character or emotion. All sense of mood and atmosphere is missing on every page. The hospital-esque lighting, the perfect geometry, and the soft, light color only succeed in imparting a sterilized comfort--maybe not even comfort; maybe it's just a smothering neutral hue.
This normally wouldn't be too much of an issue, particularly for a preparatory project, but given that this comic places a great deal of emphasis on the nature of the house, I think you should pay careful attention to this problem. Environments are the bane of every artist, I know, but if the heart of your comic hinges on its setting, then you are obliged to give as much character to that setting as possible. Dynamic lighting, a unique interior design, or disquieting architecture are a few examples of how you could give the house the same level of depth that you no doubt have planned for your characters.
Speaking of which, the characters also seem to suffer a similar impairment. There's nothing outwardly and aggressively wrong or off-putting about them, but, much like the house, they are chained up by their neutered designs. None of them are remarkable, and none of them are remarkably unremarkable. They are standard issue manga characters, without any of the traits that manga protagonists normally have to differentiate themselves from the amorphous crowd shots. Hair color is all they have going for them. Once again, this is a problem insofar as you make the claim in your premise that these characters have secrets worth discovering--Suar and Kenan in particular, I imagine.
Perhaps their more-than-mundane appearance is intentional, but I don't think it is a good reason to have so little character conveyed through visuals. There is nothing visually compelling--not expressiveness, not oddity, not novelty, not drama, and not sheer technical prowess. You should strive to find the stylistic method of grabbing the readers' attention and keeping it. As it stands, I can't imagine these visuals piquing anyone's interest.
There is little to go on here, but I have a few points.
As I mentioned above, the visuals are not pulling their weight when it comes to conveying character and narrative leads. The writing itself isn't doing much to help, either. Now, that said, I want to point out that the hook regarding Rul's paranoia is by far the strongest part of the story so far. It's amusing and it suggests some key parts of Rul's nature, namely his superstition and conspiratorial leanings. It may be an unfair comparison, because there is far more overt drama there than in the secretive student guests, but I maintain that it is far closer to the tension of the premise than the other plotlines. I want to know if the house is haunted or if Rul's imagining things--or maybe better yet, I want to keep guessing.
The students are just not interesting. They speak their minds at all times, and their constant commentary on what other people are doing or saying sucks the tension and weight out of every scene it happens. Sure, it's early, and they've only been around for a few updates, but time is precious in the comic world. Every page without a hook brings you closer to a reader bailing out. Without visual hooks, you're relying on the writing to keep the reader invested, and right now, the story isn't bringing me closer to the primary conflict.
It begs the question of what the purpose of the school hi-jinx are when the main plot hook--the possible supernatural nature of the house--is so strong. Once again, the strongest moments come when the nature of the house intersects with the nature of its residents. Kenan's question about why the house was so inexpensive was funny. His staid election as class representative pales in comparison. At least for me, it is a missed opportunity. This could be something you feel you should reflect on--weighing the worth of the house and the worth of the student drama. You know where my bias leans.
There isn't too much to go on, but there is enough to notice an unfortunate pattern of sterilized visuals and dialogue that so far have confounded the primary premise of comedic intrigue. The premise suggests depth, but that suggestion is all there is. Hints come from incessant character commentary and the meta-commentary of the creator, not from the comic itself. The problem is underscored by the conflicting plot lines of student slice of life and a mysterious house--the house trumps the students, but that makes the slice of life comedy frustrating to wade through.