If someone shows me a picture of a haircut, or a dress and asked me if it would look good on them, I can't imagine it. My mind does not work like that. I just can't visually see it.

At least it saves them asking you now, I guess?

There's no way to win in that situation anyway - if you said "yes I think it'd look great!" and then they went and got their hair cut to match your suggestion but didn't like it, is it your fault for saying "yes"?