It depends on the stuck skin, and the situation. My ball python tends to have bad sheds on his head, where a few scales are left behind. His humidity is up (my house is an avg 70-80% consistently) but it still just doesn't come off.
Peeling, easily fixable stuck shed though is definitely a turn off.
I would think they would at least clean before a picture... meh. I would be immediately turned off by the dirtiness. Just because it's me.