I'm a skinny 16 year old boy. I want a tattoo on my bicep, but I have little muscles. I really want a tattoo, and hopefully it will motivate me to get bigger.
So… will the tattoo look different if I get it then gain muscle?
It depends on how much muscle you gain and how quickly. If you gain muscle naturally, it'll probably be a pretty gradual process and I don't think it would affect your tattoo much. Don't suddenly go into overhaul trying to get buff as soon as possible. Take it slowly and see if you notice any changes. On the upside, biceps aren't an area that generally get stretchmarks, which can be a tattoo's worst enemy.