Looking good so far, but for the folds i would look into some stylized examples and go into that direction. right now they are too blooby and wonky. give them some clear straight lines and directon. for example: https://www.artstation.com/artwork/PmGdJL
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for example:
https://www.artstation.com/artwork/PmGdJL
aaaaand done !
more pictures here : https://www.artstation.com/artwork/8wmqRx
thanks a lot for thelp and feebacks guys !