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Unfortunately, I don't speak the language you wrote in, so I don't know what you're saying about this piece, but I figured I'd put my opinion in anyhow...
The least believable part of the photo is just below the wrist and where the skull meets the arm. It doesn't quite work there. Other wise, good job. I was scared. :-O

Google Translate: Italian to English... "This digital artwork was created in 5 hours in two days. The hand is steady, property is destined to remain so for eternity, unable to move, see and touch anything. Dead Hand is the name that seemed more appropriate. For more information visit my blog."