amirababy as a general rule look at this picture (by Sodwee),
GREEN = OK GO
RED = NO GO
The original image is provided in Sodwee's blog which I recommend you to read. Google this:
"Tattoos & Emirates. Flash Update. The Red Polo Case."
There are very few exceptions, however, if you're a
male then they
may let you join with tattoos in your forearm area (they should be covered at all times). In the leg area specifically, above the knee is OK. Below the knee I wouldn't know but I would say it's also ok as males wear pants all the time.
If you are
female, then follow the image strictly.