Here's my critique
[link]The lineart in this picture is pretty messy and scribbly. You could make it much better just by using smooth lines. The background seems to have no effort put into it. It doesn't take much effort to put some more detail. The drawing itself is nice, though :3
[link][link]The anatomy is really off. Huge heads and eyes, and tiny waists. You're drawing people all the same, like they're some sort of generic bratz doll or something.
[link]Messy picture is messy. There's that icky layer around the lineart that you could easily evade by using layers. Don't have a digital art program with layers? Get GIMP. It's free, and as good as Photoshop.
[link]Again, messy lineart. The hair looks rigid, like it's a plastic cap.
Also, that bullet wouldn't travel with a solid red line trailing behind it. Blood would be streaming out into the air. It wouldn't already be caked to his shirt. Also, why is he sleeping? If I got shot, I wouldn't have a calm expression, that's for sure.
[link]This drawing is good in general, but the colouring is pretty messy. Also, it's boring. Add a background, and it'll look way better.
<3