Maybe it's my lack of imagination, but I would never think to put a red shadow tone between a dark grey and a green buffer tone. Here the green and red cancel each other out by design. I really like the jacket creases around the bicep and the ankles, though I feel like some of the other creases (especially around the knees on the subject's left knee) seem separate from how folds would be created by gravity and tension acting on the material. Did you use a reference for the subject or for the folds? (I usually swear by references, especially to add detail and points of interest into your reproduction of a subject that you might not normally memorise.)
It's happy thing someone look on my work deeply. First, I inspired by character portraits of @DmitryDeceiver and tried to express like him but failed. And I kept to swap colors of this with almost randomly picked colors until I satisfied. That is why there is a red shadow on them. I just felt it looks ok.
And, of course, I used some references for this, especially folds of a coat. However I don't like to draw the same as references.So this will be very different from the real thing because my imagination intervened a lot.