You've got a nice background and good light coming from it, but you've wasted it by just leaving the render on top of it all and not doing anything to blend it into the sig apart from what I think is a fractal in the bottom left. There are many things you can do to it right now to make it look like it's a part of the sig and that not just any render will fit.
First thing you should do is remove the drop shadow on the render. It really doesn't look right. Remove any other blending modes as well if you've got any set. I think I see a bevel and emboss effect on it but I'm not sure. Also try making the render smaller so that it doesn't take up 80% of the space.
Easiest thing you can do after that is to take a light orange soft brush (hardness: 0%) and go along the edge of the render, simulating the light shadows on it's shoulders, head and going down it's arm. For added realism use a darker colour on the left of the render as the light fades around there a bit. Set the blending mode to "soft light" and adjust the opacity for best results.
Other ways to blend would be to make a new layer and to add some splatter brushes to it. By this I mean using a splatter brush to cover the divide between render and background. For each splatter brush you use make a new layer. When you've added a few, hide all of the splatter brush layers. Make a new layer on top of it all, go to the image menu at the top of the screen and select Apply Image. Duplicate this a few times so that you've got one for every splatter brush layer. Move the applied image layers on top of the splatter brush layers and turn them into clipping masks by right clicking on them and selecting "create clipping mask"
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Now take the applied image layer, any of them, and move them around a bit. You should see what they do now. Move it around until you find a nice patch of it to blend the render and bg into one. Try rotating it if you can't find a suitable patch. Do this for all of them (there shouldn't really be many as there isn't much space) or until you think it looks good. Using too many can clutter the sig so use your head and know when to stop.
Based on some of the sigs I've seen you do so far, I think you need to work on your text. This isn't just for this sig but for all I've seen of you. Text is often a part of sigs that many people have trouble with (myself included) As I'm no expert on text, I'm just going to link you to two tutorials written by 1lasthope. They're both great tuts and really worth reading even if you're a text expert.
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You've a bit to learn before you become a great sig maker (and artist in general) but just keep at it. You've got some good ideas, just need to work on the execution some more.