Looks quite nice. I would suggest changing the c4d's that you put because they contradict the flow of your sig. At the left side of the sig, the flow is going in a direction like so: --. However at the top right, the flow starts going like |. The c4d's also overcrowd the sig a bit but I like your attempts at depth. Sharpening the render did help but try to not always keep the render/stock in the center of the sig. Other than that, the c4d at the bottom far right has colors that don't really fit with the rest of the sig. It's pretty good though. Nice job.