Haha, well, I can try.PhoenixStardust wrote: OTL Now accepting critiques! Be as honestly brutal as you can!
The Halloween one seems the best so far. I think you're going in a good direction in many different ways, but to make your art professional-looking, all of those things need some improvement, too.
Proportions are definitely important. For faces, some of your eyes are too high on the head -- they should be halfway down, and that's not counting the volume of the hair. Some anime styles go even lower than halfway. Make sure those eyes are lined up properly. The Halloween one is pretty good on this front, but weak on the calves and feet. (Although, in VNs, you probably don't need to draw calves and feet so much.) His arms/body don't look bad, but you could work on the shape... on the left side I'm not quite getting the sense of volume that I should for his body, particularly in comparison to the right side. (Things like the Nightmare Before Christmas are highly stylized; the thing that's important is that all of the parts are consistent with each other.) Also, based on the position of his shoulders, the elbow on the left should be lower. Also note that the way you have him drawn, his body is twisted around. His upper body is at an angle, but his waist is facing us. It's okay if this is intentional, but I wanted to point it out in case it wasn't.
Line art -- well, I don't have a lot of comments because I'm not a good judge of it, but I will say... experiment with colors other than black. (And generally speaking make sure it's clean & neat, and remember that line thickness is an artistic choice you make.)
Coloring -- I like your palettes, and I like the like texture. The coloring itself could use improvement. Again, I think the child is the best, especially with regards to hair. Some of them have hair that look... for lack of a better term... Photoshoppy.
More generally, though, I think you're in a good position to take your coloring to the next level by really, really thinking about not just the direction of light, but the color and effects. Think about what color the ambient light is, what color the highlight is, and where reflected light might be. For example, look at how lighting is used in this random image I found on Google when I searched for The Nightmare Before Christmas: Finally, pro art will often use poses to a great effect. So, practice those, and post them for feedback. ^_^