I see that everything looks good. The only issue I may see is that you should focus on "what's important" in the image and I see you doing value changes in clothes pattern when it doesn't really help with the story. Focus on giving contrast to what's helping to tell the story of the images, do the lines in the clothes help tell the story? No... those details would be ok to be lost or not put in it.

This is a great exercise and you have some awesome studies already! My personal recommendation would be to try more studies using only a hard brush without texture, as being forced to decide where to start and end the middle tone helps develop more keen observational skills when it comes to value.