Someone who is having difficulty to find something out, after strugling a lot with no success, needs a fresh pair of eyes to assist them. So to complete the sentence with the appropriate idiom, we can finish with "What it really needs is a fresh pair of eyes" <em>(another person to examine closely in addition to anyone previously.)</em>
Explanation: While you might doubt it from how it looks, it is right. You will have to add it due to the possessive factor, as it shows it is somebody's tattoo artist. (I might have interpreted this wrong though.)
