Chris!Steve tends to align rather neatly with my mental image of comics!Steve, so I'm sort of helpless there. They're visually inseparable in my head.

Tony for me tends to default towards a generic comics!Tony—tall, golden skintone that doesn't see enough sun, lean built but decently muscled, goatee, blue eyes. Even reading a movieverse fic he ends up that way. When I write movieverse I try to make it more RDJ-like, but that's all.