In general, not a problem, most people are curious and will give you a thumbs up. I have had a few people touch my tattoos without warning which is something you might have to be aware of.
Emirati people are cool and friendly, but there are some more traditional people who have never seen a Caucasian person before, let alone one with tattoos.
I prefer to cover up in the airport, but out and about in malls ect, its no big deal to have some ink showing as long as it's not offensive.