I would say for me, late summer/early fall. I usually gain about 10 lbs over the winter then I lose it in the summer. Secondly, after a few months in the summer sun, I get really tan and I tan a beautiful golden brown. Girls seem to like lol ;)
I look better in fall, winter, and spring because I'm more comfortable in that weather. In the winter, the way the light reflects on the snow makes my eyes stand out as well as the fact that the cold makes my nose red and has a cute-ning affect.