Feathering so quickly?

Hi, I just got my second tattoo from a great tattoo artist. First one was a full color monarch butterfly on my ankle which looks awesome. Got the second one about 3 weeks ago, a black and gray vine with flowers around my other ankle. Some of the lines are really fine and perfect (just what I wanted) but others are thicker and there is feathering/bleeding under the ink as if I've had it for years. I followed the same strict care for both tattoos. What gives? There's nothing that can be done now, but should I go back to the artist and show here? Thanks everyone!

sounds like artist went a little to deep with low desinity tissue areas this will sometimes happen. see if the artist can shade the area in question a little or maybe make the lines a little bit thicker for ya but it does happen not supposed too but it does