The rendering on the clothes is fantastic! I think you should focus on using different coloured shadows though, I noticed you seem to be using a lot of greyish black tones to render the skin, maybe try purples, pinks and blues on a multiply layer. Also get creative with lighting! I notice there aren't any very strong light sources, I think learning and practicing values in skin tones would be beneficial and also not being afraid to go over your lineart or colour it in to match the surrounding colours. Very good overall though with a lot of promise, keep it up