Nice work so don't take this the wrong way, but why would you pick something off of a wall? I have seen that flash in almost EVERY tattoo shop I have been in! Again, I'm not tryin' to bash your work because it is very colorful and the linework is great but doesn't your artist do any custom work? I have always believed that if your gonna get ink, get something that noone else has or seen before, that way people tend to be more curious and it means more to ya. Keep me posted on any new ink.
Flash work or not, the tattoo is pretty good. If he likes flash, let him. Unique doesn't HAVE to be a huge part of tattooing. Not everyone needs a "story" behind a piece of work. If you like the picture, get it inked. Don't worry about whether people might say it isn't original.