1) Bad placement of your render + not any flow effects on it to make it a little bit more realistic.
2) Text size = wrong. Also, bad move to add random texts in order to have what? A typographic signature? No If you want to do that make a wallpaper with only texts inside.
3) What is that backround? A orange color as for your backround and you done? Nope dude the backround it is one of the most important things. No backround no composition dude.
I think your problem is the lack of resources. Go search for packs C4Ds, ready wallpapers, Textures and etc and work on it.
This is my advice.