Why you gotta be an angry burd
Level 16 Gladiator: Spartacus' Retiarii
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Draw more from real life. All these are pretty smudgy and flat and fail to show the form consistently, especially the first one feels to have issues in this (like where the arms are supposed to connect in the body, the side view shows it to be much more lower than in the front view and the shading makes it look like the body is going up in fairly straight manner, but the front view shows that the sides of the body are very angled).
In the dragon the anatomy and form fail pretty completely, the legs are very cartoony and unrealistic and I just can't figure out how the form of the head is going.
The last bug has some nice parts, but also falls to the smudgy gray and flatness (and seems to have pretty inconsistent perspective).
Except that you can always post your fixed version of these images.
I probably will, but not any time soon since I'm extremely busy studying Graphic Engineering that has nothing to do with drawing, some subjects that are related to drawing lack knowledgeable professors, so I'm on my own.