I got my first Tat when I was 16, I decided on a Tribal eagle that is similar in style to yours. Shortly after I started lifting weights and put on about 20-30 pounds of muscle in 1 1/2- 2 years. My tat didn't distort at all, the broken lines of the design really helped.
As long as you don't get a fine line you should be ok.
Great looking tat by the way, I would definatley get it done.