wow, thanx a lot for your replies, guys !
Jothmom: Can you post a link to an image of piros trees ? Would be very interesting !!!
DadCantDraw: Would be curious about the tree of yours !!! i agree with you, the hole must be darker. Will add this to the texture. [EDIT:] This is a cool reference picture you have there !!! [EDIT END]
Keen: i could post a wire and the uv-map later this day if you’re interested (i’m at work now and can’t access my files at home… ).
Basically, i started with the trunk which is nearly cylindrical. Then i looked for further cylindrical pieces in the branches an uv-mapped them piece by piece. For the thinnest parts of the branches, i switched to cube- or even planar- mapping. To avoid to much stretching i worked with a checker pattern a lot and tested the uv-map with the origial texture again and again and again and again… Needed a lot of scaling and tweaking, still it’s not free of distortion, but now i can see the ligt at the end of the tunnel LOL