Back of the shoulder isnt bad. My sister got her tattoo there about a month ago and she did fine which i was suprised about cause she was so nervous and scared. She is tiny, just skin and bones. In terms of the back that is one of the better places to get it, spine tends to hurt. a friend has a vine going across the top of her back and she said when they got to the part on the spine her arm went numb but was told by the tattoo artist that that is normal.
as for black vs color, now adays they both last about the same as long as you take care of it. and most tattoo shops will do free touch ups. If you are doing a flower, color is the way to go. it wont look as good in black/gray.
Main Questions to ask tattoo artists/What to look for in a tatto shop:
1. Do they use sterilized needles or new ones. (new ones are what you want)
2. Look at the artists portfolio to see their style cause like anyother artist i.e. painter, illustrator, each tattooist has a different style. Maye sure it is the style you want.
3. See if the tattoo shop has won trophys/awards The more the better, that way you know they do quality work.
4. Does the shop do more custom art or flash art? you want a shop that does more custom art. meaning they do their own work and have the talent to draw up designs and not just trace from flash.
5. Check with your state health department to see what shops constantly get good check ups and which dont always make the code.
After you get the tattoo, use Palmer's Cocoa Butter. It does wonders. Much better than things like Tattoo Goo and others made for tattoos.