Problem with logo modeling!!

Hi guys! Could you help me with following… Watch image. Why this triangles appear in rendered image?

Bad modeling possibly.

Well, without a file for check, we cant see anything.

I see triangles,i suspect normal are inverted in some places,. as said GrimZA, look like the mesh topology is itself the problem. But again without a file or at least a shoot with topology, we cant do much about it.

The renderers only handle triangles so all models are triangulated at render time.
If you have non planar faces, then when triangulated you may see the actual triangles, especially if they are long thin ones like you have.

Look at smoothing options or model correctly so you control this triangulation