Definitely go with an elongated, rectangular style, which will give some angularity to your face. The shield style, notably popular at Gucci last season, may work as well. You'll have to try them on. With your coloration, you might want to go for a dark, cool-colored frame - black or dark blue or green may be you best shots. Make sure that the frame doesn't "squeeze" your face too much, since that will just emphasize the roundness. Stay away from aviators.