Am I a good candidate for Invisalign? If so how long would it take? (Photos)

Hi there, I've wanted to straighten my teeth as long as I can remember and am finally reaching a point where I may be able to afford it. I am strongly considering invisalign and I'm wondering if this would be a good option for me? If it's possible I would also like a ballpark estimate of how long it would take? If I am willing to settle for a slightly less perfect result can the process be shortened and/or cost less? Or is it all or nothing? Thank you!