If you had asked me a year ago, I would have simply answered I like my size and upward curve.
However, I didn't realize shapes could vary so widely until after joining LPSG a few months ago - and as a result I've come to really like the overall "appearance" of my own, aside from size: An even girth over its length, a head the same width as the shaft, fairly smooth with a few veins, uncut but without too much foreskin, not distorted by pumping.
Sometimes I feel like it's better than I deserve... at which point I try to make the most of it by sharing it in photography.