Well.. The background and the Render dont match. The render doesnt stand out. And u should blend ur render and use brushes to make a nice background that goes with ur render.
This is a 3d signature. If he blended the renders it would look horrible. Just wanted to point that out. A good way to better your text, is to go to layers- than blending options. Mess with stuff like, drop shadow, stroke, outer glow.whatever suits the type of sig you're doing. Also try lowering the opacity to make it blend more. I think this is a pretty cool sig.