For your first sig, this isn't bad at all Sendi.
Nice to see you here in the Gfx section Btw.
Things to work on this sig should be blending.
There are shitloads of ways to do this,
Too many to really get into on here, so read tutorials on blending your render.
Try not to make your c4d's so obvious as well. Find a way to incorporate them
without making it look like the only thing you did was slap a giant c4d in there.
Text is a pain in the ass for ALOT of people, try reading Haze's tutorial, it's helpful.
My first sig was horrible...yours actually isn't bad.
Oh and always remember to hold shift when you use transform to resize your renders.
Because this is your first sig, I'm rating it an 8/10.
Just try reading up on tutorials, and you will be up to speed and learning in no time