OK, I'm about as ungraphically gifted as they come. And after seeing some of the other work here, this is almost embarrassing, but, here is my rendering of Cosmos.
It's awful. Kill yourself. Actully, it'd pretty cool. Could you make his underside a little deeper/thicker? It seems a bit shallow compared to the toy. But I like it a lot. Cosmos was always one of my favorite minibots, if only for his kickass vehcile mode.