s c a r l e t
Not really an expert in drawing, but I think you need to work on your shading. Try to imagine the light source in your head and think about how the light would affect your character's shading. That might help. The second one probably has the best shading out of the bunch, but the work, overall, feels a little plain.
And your drawing, in general, will improve a lot with practice. So yeah, just continue. ;]