You use pillow shading on the clothes but not the head which is both inconsistant and unintresting, here are some videos that would help www.youtube.com/watch and www.youtube.com/watch
You also used a lot of colors that look too similar and you could cut down your pallete, here is a video that could help with that www.youtube.com/watch
It's not like I'm a pro but I think that this might help so here you go
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This looks good but there are some red pixels scatered around and it looks like strays.
The out lines and string all have a lot of jaggies, here are some videos that can help www.youtube.com/watch and www.youtube.com/watch
You use pillow shading on the clothes but not the head which is both inconsistant and unintresting, here are some videos that would help www.youtube.com/watch and www.youtube.com/watch
You also used a lot of colors that look too similar and you could cut down your pallete, here is a video that could help with that www.youtube.com/watch
It's not like I'm a pro but I think that this might help so here you go