The purpose of HD is to be more defined, more detailed and overall better quality. All you really did was resize the sprite and clean it up. You added no additional detail nor have you changed the lineart at all. It's not a bad sprite but you're doing no justice making it that big if you aren't going to actually detail it a bit.
Your right. Once again, this is new to me. It was actually made bigger because I'm trying to develope a game with a screen size of 640x480, rather than my regular 320x240. Oh well. Thanks for the advice.