Your more recent ones are great, you do skirts very nicely.
I must say your little sprites are adorable.
Anyway, my only piece of advice this:
Try not to shade to shape of the body, but the shape of the folds and where the clothes drape. Hair is really hard, but I think you can really improve if you try to make the strands longer, make it more flowy. try using the curve tool for hair. <3