I sketch something up every now and then (aka almost everyday) and I thought I'd share, if anyone is interested. I've been doing traditional art for a time but only late last year I've decided to get serious about art AND learn digital (Manga Studio in particular).
I'd also like to warn you that I occasionally work at retardly high resolutions and I'm too much of a fuccboi to resize, so please, bear with me. All considered, enjoy.
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Great sketches, you can clearly see improvement as the sketch numbers go higher and higher. My advice: keep doing what you're doing - you are on the right track.
You could also start trying to work on cleaning up the line-art. Simple way is to just be a little patient and draw over your initial sketch(on a new layer), making the lines as crisp as possible. That will definitely improve the quality of the whole painting. You will have to learn this sooner or later, so why wait!
your sketch
example