Good idea, not terribly well executed.
I certainly like the idea behind this picture. P-Bot guarding the portal in a physical sense is pretty cool.
The artwork isn't great, but at the same time it doesn't make my eyes bleed in revulsion. THe detail on P-bot isn't bad. At least he's not just one huge lump of red.
Not a bad picture, really, though to be fair, the blammed pile should be about fifteen times higher than the protected. :P