can shading be covered with color

so i got this tat about two months ago and i dont think it turned out to good. initially the guy missed a bunch of lines in the banner and shillaly (as seen ion the one pic) and then i got a touch up from him a few weeks ago to fix the mistakes and it was a bad situation he was doing new lines in the wrong thickness, still leaving lines out, messing up lines, and coping an attitude. long story short im not going back to him ever again. here are my questions: 1. can i add color in the shaded portions (dark brown in the shillaly, dark brass color for the brass knuckles, and green for the clovers) 2. if i cant color it what type of details can i add to really set it off http://i813.photobucket.com/albums/zz55/pltown/irishrework.jpg http://i813.photobucket.com/albums/zz55/pltown/irishcropped.jpg

forgot to mention the pic labeled rework. is the picture of the tattoo after the touchup was done.

I looked at the photos and I would say you can definately color your design. I would take to to a tattooist whom you can show it to and have them work out the colors for you first, see what they come up with and go from there. They may think of things you never even thought of, and add more elements to it as well.