Yeah thats what a cover up is. basically someone got something that they regretted or that came out shiity so they get it covered up with something else.
That snake looks too dark to me. It should have has some lighter shade in some area's to bring it out more. Some color might bring it out more too.
I got a cool idea i'm thinking about doing for my next tattoo of a grim reaper in a grave yard. I saw a cool picture on google (a picture, not someones tattoo) and I like it a lot