Woooah, there are some really nice drawings in here, it's gonna be hard to point things out XD
@nathanKmcwilliams That cover looks really sweet, but it's true what has been said before. The color of the fire background is too similar to what you chose for Rip and Freya so it makes them blend in more which is a shame. Also the flames themselves feel a bit plain on the foreground area.
I'd try to make a black path in the middle and two walls on fire on the sides + back so that you can keep the flames while making the characters pop up more. Also adding more embers on top would be a nice touch I think! (I just love shiny things so much, sorry :'D)
@seaby I love your drawing! The pose and the scenery work really well and she's so cute! The only thing I can point out is that the shading overall feels a bit muddy with the grayish hue you've chosen to shade. I'd play around with some colors to help set the scene. Since it's nightime I'd choose some deep blues (or maybe a bit greenish since the sky isn't exactly blue) to darken the shadows. Same for the highlights, instead of white I'd use a really light blue to highlight the scene.
@DualDragons I really like her design, such a buff badass lady! The only thing I'd add to what has been said above is that since the fire is really bright and pretty close to her body I'd use hard light when it comes to highlights, I think it would work nicer.
@IndigoShirtProd That looks REALLY cool! I think the only "wrong" thing I see is that Demetri's left wings has an awkward angle. I think the outside surface of the wing that is seen below the wing bone shouldn't be seen, or at least it would be smaller since for that perspective it would be partialy covered by the bone (I hope I managed to explain myself, that was weird XD)
@Mira_Astralis I feel you, lineart is a pain. Either way if you want this sketchy style to be your finished product I'd suggest to clean it up a bit more, just erasing the bussier areas would be nice (like Astra's pants and Eon's sleeves). Also Astra's color palette looks too similar in hues, her hair, shirt and skin are pretty close color wise. I'd play around with contrast, I'm sure you can find some interesting combos!