Check out Science Ink for inspiration. https://www.amazon.com/Science-Ink-Tattoos-Obsessed/dp/1454912405
Sure! http://imgur.com/qQUNNwL Since you're interested in biological tattoos, you might want to buy this book: http://www.amazon.com/Science-Ink-Tattoos-Obsessed/dp/1454912405 my brother gifted it to me after I got the tattoo done and it contains several pictures of scientific tattoos (biological, medical, astronomy, evolution, math) with description of the meaning. A very nice read ;)