Lowkey this is really good. I am no professional by far but something ive found for limbs is putting them in like ovals to show limbs and them overlapping. For the leg on the chair it seems to stick out a lil weird, I might be wrong but I kinda pushed it more overlapping. For figuring out the arm going over the chair I dont think itd go dirrectly like 90 degree back but more draped over. Its really good and im sorry for probably not being very helpful, but some small tips like boxes etc can be very helpful being combined with the already large ammount of knowledge and skill you have. <3