>>7594391
Your forms are pretty flat. Study perspective and apply it to your art (i.e. using 3d forms to construct your characters, overlapping forms to impyl depth). I cannot understate how useful it is, even if you go for a more cartoony artstyle. Also never shade with just the airbrush! Hard shadows are important for showing form; hard shadows work in pretty much every scenario, while soft shadows without some hard is uncommon and hard to use (and hard shadows would work just as well anyways)

Picrel is not really a critique, I just liked her design and wanted to draw her. Though you can see how I used perspective, even if subtly, to make her form not feel flat