As for visible tattoos (neck-up, wrists-down) I personally cannot do it since it would be a career stopper for myself, unless something changes drastically in the near future. At the same time my sister works in the creative field and is contemplating a forearm down onto the hand tattoo which is fine since in her field it is accepted. I will eventually get my hands and possibly side of my neck done after I retire or near-retirement. I love the look of hand tattoos (especially Thomas Hooper's stuff!) but I don't like the idea of wearing gloves everyday (already committing to long sleeves in a month).
Not only work related but as I just finished my larger Dante's Inferno leg tattoo I already am starting to HATE the staring/questions of a tattoo that is visible, and the idea that I could never cover it up might be a bit much.