Question Everything: funny premise, poor execution. It feels a bit too long and then ends abruptly. I would plan ahead (draw thumbnails on a sketchbook) before drawing the actual comic so your text is not just placed on top of drawings. Also, put it in speech bubbles so it doesn't get lost with the sound effects and what not, it will make it easier to read, as well.
Close to Death: Ok, first panel makes it look like the second panel is actually the first. I would flip those two panels, if this was a manga (traditionally read right to left) it would have been fine. I hope this makes sense, I know it's difficult to describe without pics, sorry! Also, punchline, it's a bit too sudden, and kind of has a flat deliverance.
Sneakin' Suspicion: Alright! This one is the better of the three! Pretty funny and I like how you colored it. This one could GREATLY benefit from speech bubbles as I am not sure if this person is talking, or thinking, or reading out loud. I am just assuming it's thoughts. Make it clear to the audience. Remember comics are about SHOWING.
Overall, I think you are improving, but like I said, you need to study comedy so you can get better at landing and telling jokes. Find comedy strips online or watch comedians, bleed what you learn into your comic. I know most of us like to think that we are the shit, but it's always nice to have outside influences, it only makes our own work stronger!
One last thing that kinda bugged me. If someone asks you a question, just answer them! Don't hold anything at ransom because they aren't going to sub to you, that's so douchey! Be nice, interact with people (even if they don't sub to you). You attract more flies with honey than vinegar!