yeah, I'd be unsure about it. Personally, I think seeing a doctor in real life could be more helpful -- although a picture service could provide motivation of some sorts, maybe?
Like, if you're like me you're unsure about "what needs work" and you're friends are going to tell you that you don't need surgery, including your doctors. But you some how feel that something is needed to be improved, even if you don't "need" surgery to pass, it might help you to feel better. It's like my ex really wants a nose job -- she doesn't "need" a nose job, but really is uncomfortable with her nose even though no one else thinks it looks bad.
It's like me working on my voice. People keep saying it sound female and I actually have people who do not like how I sound when I apply what I've learned in voice therapy because they are used to the way I sound now and claim I sound amazing. Yes, my normal voice seems to get me around and I haven't been sired on the phone, and people might be fine with it, but personally it's something I want to fix to feel more confident with.
So, I can see how a picture might help. I know I played with voice software to see what my voice would sound like at different pitches.