YARGH! Post an example, and I'll be tellin' you the way. Without seein' your picky pics, I'd say clone brush, or copy non shadowed area, paste over shadowed area, and erase (soft brush) hard edges.
There be no one way to be doin' it, but these two should get you started.
EDIT: Sorry I thought you meant from Photos
AHOY me choppy chops!
The good ship Chio sails... soon.