(If this sounds harsh I did not intend to)
The thumbnail lead me to believe it looked realistic, but on closer inspection, it does not appear as realistic, The nails, shadow of nails, and blood drops don't appear realistic, but I am able to tell what it is.
What I do like about the tattoo is the wounds, which are more realistic than the parts mentioned above.
I also like the concept of the tattoo. Spontaneous, interesting and does not seem to be something the wearer will regret. (Most likely due what seems to be a "I'll do it" persona that is coming through the text,)