You can't put your work down, always keep positive. Personally, I think the render needs to blend more with the sig itself. Perhaps add more detail in the background that is a similar colour to Megatron, and maybe add some brushes that slightly overlap him, just to make him blend into the background more. (Or, you could do the sensible thing, and keep following tutorials instead of my nonsensical babbling. )
Megatron is too small, you need to make him much bigger and have his outstretched arm go off-canvas. I would get rid of the really thick stroke-line around him too. For the background, all I see is a few C4D brushes on a white canvas. I would start by filling the background with a color that you think fits with the sig (probably a light red in this case), and then brush new layers of other reds over-top, smudging them together. Try to add a light source behind Megatron with a large soft white brush. The text needs some improvement, I would suggest changing fonts and moving it closer to the render. This is a good attempt at a sig. As Katanga said, be positive and happy with your work. Just keep trying and follow some more tutorials, and you will improve. Once again, this is a good start.
Ok, well to be honest I would rather listen to you guys here on Forgehub than the tutorial... the tutorial was ****. To be honest I aren't going to do anything with the sig, I made it using a tut. because I was bored. PS - Guys this may sound stupid but what actually is a C4D?
Theres different kinds. Technically a C4D is something made in a specific program. There are different types. You have a fractal C4D ( or atleast i think), which in my opinion are ugly as ****. Then theres my favorite, Effect C4Ds. These have light spots and dark spots that create effects to your picture when you set them to different things. I prefer to set them to dodge, making the light spots show and creat effects. Then you have normal C4Ds that you might now set to anything. There more there just to put on your picture. I believe Juggernuat won SOTW using this kind of C4D and effect C4D. EDIT: Forgot to CnC... I dont like it. The colors dont blend ( thanks to frag for teaching me bout that), Theres NO flow, and the focal is small and eithor low quality or blury. I cant see any depth aswell. I know your a beginner..So ill say this, dont use Renders, i hate them. Use stocks. Stocks are the whole picture, not just one charactor cut out of a picture. With this, blending, depth, and flow are easier to get.