Many thanks for your comments and advices.
Personally, I can't choose between baseless and with the base (normal position)
Yes Bill, the white balance is a bit off (I did set it on "cloudy" because I shoot with the daylight, but indoor, flash off)
and the third photo is a trial to adjust this on the PC.
A trial and horror...
Yes, the thickness of the bark is inconsistent. Because the odd shape, like you said, but I'm not worry about, just I'll try in the future to correct (maybe by hand carving a bit ? )
Mark,
your suggestion is appealing, just I have to find a jig to hang the piece without damaging...(will follow)
Tom,
no problem to angling the thinner part down. I'll shoot some pics when I have a solution to hang the piece following Mark's suggestion
I will thus continue my tests
I will keep you informed of my trial and error
Friendly,