I can only speak from my personal and limited experience. My latest tattoo had red, but only very little (about the size of a jelly bean). It didn't take to my skin as well as the other colors...it faded and looked leathery (though I would describe mine as more murky or greyed out). Very peculiar, but it's nothing that couldn't be fixed with another quick session. Like ezh said, red ink can be more touchy than other colors, but it depends on the person's skin. Since it's only been two weeks, I wouldn't lose any sleep over it. Give yourself another 2 - 4 weeks to heal, at which point you'll be in a better position to make a fair assessment. Touch ups are usually free and I'm sure if your artist is good at his job he/she will do everything they can to make it look awesome -- after all, they have a reputation to uphold. 😉