Why dont you try to make something unique?
Gunz lacks nature-ish maps.
There are a dozen skillmaps, which i still think are pointless, a million indoor maps.
And a couple rather ugly outdoor maps.
Even with the limited functions of radiant i made Snow_Wasteland and Scoutzknives, i consider them my best work with radiant.
You have to work on your texture placement and scaling.
Make some projects and keep them to you, aslong as you only test stuff, test maps dont need to be released.