[PAID / NSFW] Looking for senior to fix a shading problem (normals / tangents) with my model (Maya)

Stan01

Hi,

My human model goes from light to much darker shade in an instant and dark artifacts appear and a black line separating them. If I change the model import's settings Tangents to Import (from calculate mikktspace) it looks a little bit better, but not much, also light seems to be affecting it.

It's not related to normal texture it seems, because it still appears on a white material

Required software: Maya.

if you are interested please leave me your Discord.