I like the idea that someone looked at the sketch, probably, and thought
"What? Tony Stark without at least one being totally in love with him? No hot women? No cap? ...you knwo, there´s a little bit of space down right there. ...How about *flaps arms in creative gesture* lizard?"

freaky lemon yellow wig
I agree. There is blond and there is yellow...hair is not suppoed to be yellow