um, i would have to say somewhere in between those two photos. i'm a similar size/shape to the first photo, and most of the time i am completely comfortable and happy with my body. i would prefer to be a bit thinner but i've never had any complaints about my size.
i do find the extremely thin body aesthetically appealing, but in terms of my own lifestyle a healthier size suits me.
EDITED to say: i realise that some people are naturally as thin as the second photo. if that's the case, well, what good luck!
I don't really have set ideals about what is too thin or too curvy, I find both attractive. I feel like as long as a person is healthy then they are attractive.
