If your goal is to have three different tanks, perhaps the first two guns are too similar. The 3rd one (missile launcher?) stands out. As a player, I should be able to look at a tank and instantly recognize what kind of stuff it's gonna shoot.
They all have a nice, beefy shape. I think the orange lighting is the best on the middle row, with just the single, orange eye - but the third row looks alright (it'd be cool if the orange vents fluctuated as the tank moved). The first row has too many "eyes" - looks like a bug. Save that look for another kind of tank.
Would like to see how it looks in game - might change my opinions.
Thank you vry much for your advice..
Yes the first one have maybe too many eyes... and your right about the fact that the player must immediately reconize the ship to determine the threat during the game..
So i'll keep second and third row...
Ill keep the "eyes everywhere" concept for more organic ennemies..
Just a word about color... the blue ones are for space and sea levels, and the green one for land levels..