It must suck to have someone criticize something that you got permanently tattooed on your arm harshly, so I'm going to do it softly.
The artwork is very bad. Color or not, it looks like something a social reject with 0 artistic experience would draw in his notebook during algebra class while listening to megadeth.
Before you get a tattoo, go to several tattoo places and look through their portfolios very carefully.
Uh.. Sorry to break this to you but that dude already had it tattooed, they're just bringing it back up since he decided to rear his ugly head in here again.
edit- Wait, it seems like you know? But youre telling him to look at portfolios...I am confused sorry.