Sever was a squad mate of Commander Reek on Geonosis. He and his squad were sent to clear the Execution Arena. There, he fought a Geonosian General, who he easily killed, and took his vibroblade as a trophy. After Geonosis, when Reek became a commander, he chose Sever to be his second in command. Reek nicknamed him for his..."obsession" of hacking up droids and humanoids alike with his vibroblade.
Good. I'm a little confused, since the first judging is about Droid Design. Well, I think I'll count that as weapons/accessories. 3/5, since you only seems to have customized the sword. Coloration and design... Clones do all have the same design, and green is a not-much-used colour, you seem to have done good work with painting, so 4/5. Deadliness... I'll go with the storyline and say he can pwn if he wants to. 3/3. For the creativity... Clones are way over-done. Too many. But I give you a point for calling him Lieutenant instead of "Commander". 11/15 total.
Yours did actually pretty good! What are you talking about!? You might get 3rd place! Also, I rated it lower because you did not make any custom weapons, you did not make a background, and the detail was good but not as good as it could have been. Don't hate me please. I am only being honest about my opinion.