Thanks for all of your advices. Now I have used a program for creating all of my maps, and refining the height map inside of photoshop.

Looks gorgeous, really! Great work!

Out of interest, which program did you end up using (besides Photoshop)?

Thank you .I have used b2m. Inside b2m I then loaded my custom heightmap combined it with the generated height map from b2m.

Well, looks pretty good for a first try (actually it would also look good for the 999th try :) )!

How was it rendered? Marmoset toolbag?

Well, looks pretty good for a first try (actually it would also look good for the 999th try )!

How was it rendered? Marmoset toolbag?

. I rendered with maya + vray. Afterwards I created this blur effect in photoshop (I dont want to increase my render time ;) )