Hey, Robert.
First of all, I would make more of feet in your place. They are now such blocks, you need to highlight the anatomy, for example, to sharpen the thighs, especially the forehead (from the profile to be equal), to stay in the knee. Next, you need to realize that your thigh is over the shin:
Regarding drapery, this is a complex topic. In a simple way, when the limbs are stretched and resting, where the bends often (in the knee, ankle or elbow), the organs are created in the chessboard pattern (slightly irregular).
When the hand is bent, then the wrinkles of the cloth radiate from the outside of the bend (elbow, knee)
or from the place where the cloth is already sharpened (in the armpit).
In the inner side of the bend, the cloth is shuffled into the organs.
But it is very unified. It wants experience and practice. It is best to dress somebody in similar clothes and take a picture of him and try to imitate it.
I would still play with face, soften the features
I wish good luck in the next job
Cheers Borek
P.S.