The three-wheel-robot looks nice! But the metal is not so convincing. Polish it. And a stronger yellow and strong blue will give a better effect. And switch the colour in the rusty/damaged parts to other then blue, but brown or the like with some light edges. And make he whole piece clearer - take a way the blur. Plus give it some shadow, especially on the wheels. The lights on the arms should reflect light on the metal edges, not just a round circle.
that last one looks promising ^^
but there is one thing that bothers me :p
all the attributes on her look as if they are just layed on top of it, not as if they are part of the character and go along with the shape of the body.
keep up the good work, im really curious with what the 'better' artist of DAE are coming up with. Cheers!
First of all, you're doing the right types of drawing, which is really important.
Although, more observational drawing from life would be good.
It doesn't have to anything fancy, draw anything and everything, not only are you adding to your visual vocabulary, it's just always training your hand eye coordination.
I think something you should try is blind contour drawing.
Sit down, pick an object and draw it without looking at the page.
This exercise really trains you to see and draw things as how they are, rather than the preconceived image in your head.
Anyway, keep doing what you're doing. You're on the right track.