~~~~Rhapii3 SoDaZ and others that need help read the stuff under this~~~~
Wel to make good sigs, start of with simple things, its all about placement, of renders, and bg and stuff, use c4d's for instance or other renders to create a nice bg and something in front of the focal, but dont make it to crowded...
lighting is also key to great sigs, the lighting should look right, check where the light on the render is for instance to see where it should be...
colourings, use gradient maps and stuff like that to get better colours... and always make sure they somehow match and dont clash, I stil have that sometimes, so no biggy if it does clash, its even hard sometimes for more experienced graphixers...
Flow/Compo is a more pr0 thing, but its important to make the sig look better, flow is the way that the sig goes kinda, like making the focal look like it moves...
and compo is about the composition, try and have everything look right in place, but that is also kinda hard to know as beginner I think...
text should always be near the focal, and never over the focal, under it is fine, but never over it, cuzz the focal should be the thing they see at first hand...
use burn and dodge to create better dept for instance, and get some dark sides like I always do... also using blur and sharpen makes the dept better...
that is about it for now I think, hope they help you out, and if you need any more help, ask someone that has some experience in graphix....