Ooh, that is a lovely sunset you put in Guile's stage there! Between the hard sunrays coming across the F-16's nose and the soft radiance refracting through the clouds, I'd say you really brought that sunset to life!
So which Street Fighter 2 background would I like to see you render next? Zangief's stage. That one's pretty busy and it has a metallic sort of energy to it. Or, since you've proven your crazy skills with rendering luminescence, you should give Zangief's stage from Street Fighter Alpha 3 a shot; the hot orange glow from all that molten metal reflecting off of every metal surface in the stage should keep you busy for a while, but it would be a most worthy challenge for your talents.