Gaining some serious muscle (as in Hulk-like proportions) will definitely stretch your skin, but it usually won't stretch a tattoo enough to warp its appearance. Even if you lift heavy and often, the bulking up typically won't happen fast enough to impact the appearance of a tattoo.

The actress that plays her, Grace Gummer, does not have any tattoos in real life.

Once the ash is inert and all contaminants have been removed, then they are fine for infusing with the inks.

Everence containing cremated ash is a far better and safer alternative. Adding unprocessed ash directly to tattoo ink is more of a temporary gesture that usually will not last inside your tattoo for more than a few weeks.