Here is my work that now seems to be finished. I am thinking now about changing the background of the final render, but that's not much important, because the entire model was initially planned as a texturing exercise. The aim was to make an asset that looks more or less realistic with a very simple mesh.
All the modeling and texturing were made entirely in 3d-coat. Some corrections in GIMP and rendering in Mental ray (maya)
The initial hi-poly model had about 25.5 millions of triangles. The retopo mesh has just 150 quads (300 tris) (it's a mistake on the picture)
Sorry if my english seems strange somewhere.
Any criticism is welcome