Thanks for your comments guys - its really encouraging.
Yeah in hindsight I see your both right - some freehand / decals to show the company the tank belongs too would be a great addition. I might even put some free hand art work on its like scrolls, skulls and angels. Also The highlighting came out not as bright as it could have been. So thanks for the comments, I will rework the tanks up.
Cheers, Richard
http://www.minotaurpainting.com