For Iron man did the arm swap, painted the chest circles, the plastic is slippery and the paint slid so I had to use clear red around the edges. Then took an extra stark and alex ross heads sliced them both flat and sculpted part of the hair. Then added a magnet so the face plate can sit on top of the head. Not sure if the regular head would look better or worse didn't have an extra.

Colossus I cut into the forearms and cut the bracelets at an angle since the hand side needed more cinching up. Bracelets are permanent. Now the fists don't look under sized.

Thor I drybrushed the thighs lighter blue and sculpted the chest circles.
Updated Thors chest circles and added a no helmet head.