It's not really that good.
First of all, if it's for Graal, it's not even at the right perspective. So yeah... anyway... I'll hit on some weak points for you:
- the metal pole
It looks flat and it's too dark for my taste. There should be some shine at least, so you can tell it's metallic
-the sign
come on, that just lacks detail :T
-the lights
they aren't even lined up right. the red circles don't correspond to the outer gray area. (like the gray lining is in a semi diamond circle shape, while the red circles are more round)
-the base
dark dark dark, and not very much detail. it also looks flat... is it supposed to be round like a sphere? (in diameter I mean)
-the barrier board
eww... it's tacky. you should just make it a perfect rectangle until you can learn how to better shape things with pixels. it looks badly pixelated and in order to make good graphics, you have to lose that effect as much as possible.