#10 is nice and crisp. However, it feels like the text color shouldn't be the same as the image. I like silhouettes but it is looks a bit old fashion in a round 3D circle. #12 same as #10 with additional comment: the font is too simple. #9 looks more modern and it's good, however, the color changing in the Prometheus text feels problematic. One more thing bothers me, I don't want to be considered a fire department, so I feel and more personal touch needed there.