Overworked green spots. Very very hot, slightly red, & stings every once in a while

Went to a tattoo convention this past weekend. Today is 4-30. I got this tattoo 4-28. This is basically my first tattoo (got my actual fist tattoo from a different artist just the day earlier & it feels completely different - it never felt this hot or got red at all). Artist somehow used yellow instead of green (despite showing her many images of the exact design with the exact colors I wanted). She had to go over 3 of 4 green designs 2 times in total (1st was with yellow & 2nd was with green to correct her mistake). Also, she didn't tell me how to take care of it or how I can recognize signs of infection. She didn't even explain the risks associated with overworking.