The background needs much more work put in to it. The car placement and the car in general just looks like it's there, you need to work on your blending between the car stock and your background. Lastly, the text doesn't flow at all with the entire signatures, mess around with all of the possible text settings, fonts, and if anything you can download more text fonts. If you can fix some of these things I mentioned, it could be a decent signature.
I dunno, it could be moved over a bit to the left but that's not the point I was trying to make. The car just looks like it is just there, it needs more flow and blending with the background, along with every thing I mentioned in my previous post.