Here is my problem with this. You've used Darien's sprite as a base and edited it from there.
http://www.wayofthepixel.net/pixelation/index.php?topic=430.0I have a problem with this because I don't see any credit to Darien anywhere and I don't see hiim posting to clear this issue up. I know this is his base because of a series of coincidences that make this conclusion inexcapable.
When overlayed on top of eachother, the eyes, mouth, chin, arms, nose and feet match up perfectly. The feet are precisely identical in position and overall look. the arms are in the exactly same position, the only difference being you have altered the outline in a couple coordinates. You have altered the structure of the face to little good effect, but the perimeter and placement of details in the head of Darien's sprite remain unchanged here.
Credit is of absolute importance when posting here, however, even if credit had been given, sprite edits are not the kind of pixels that Pixelopolis is designed for. There are other communities that specialise in this branch of pixeling. This is where this piece would belong, except that it would not be advisable to use Darien's sprite without first assuring his absolute permission.
If Darien did give you permission to use it, then make it crystal clear next time, do not leave it for the critiquer to find as this leaves us in a position to assume that there was no permission. However, next time do not post an edit as original pieces are far more preferable.