Here's the rundown of the rest of the project...
First I came up with a new 3D concept for the huge "tick"
On the first one I imagined it would look like a ribbon, but the client liked the 2nd one better


then I messed around some more with the background and thinned the 3D a bit



Then I tested out how the tick would look in different colors (mainly red and grey)



(the message on the image means "Happy Birthday", cause I got the job through my uncle and it was his b-day this weekend)
Final colors:
Tweaked different gradients, brightness and such... Insted of coloring every surface on the black letters, I decided to make the outlines brighter so they look shiny

Then, the client wanted to see what would it look like with puzzles in the background


Well, this is it for now, I'm gonna post the final version after the last tweaks (maybe the company's boss will like a different combination)