The bg is kinda of weird and the colors, besides the left, dont go well with the render. The line going to the center is very distracting, and the grid pattern is a bit dark. Id lower the opacity on both of them. Another thing to help is borders, it usually doesnt look very good with a white border, stick with black. but its not a terrible sig. just keep at it. You'll get better. also look around the Signature tutorials area it will help a lot.