looks like your doing pretty well for being rusty although I personally don't like the third one but it's not because it is bad it's just not my favorite of all the styles my only thing on the first two is the first one needs a slight sharpen on the render but that's it for that one and the second one would look a little better if you could bring out the texture of the blanket/material just a bit with maybe a curves layer or even just a little sharpening other than that I think your back to sterling ^_^
I really like the first one. 3rd one could be better with a different render, this doesn't seem to fit well.
not a fan of the first and third one, they're just not up to your standards imo, even tho practicing is always the best way to get rust off. anyway, I love the 2nd one, very original and appealing.