I'm going to edit the image for a project I'm doing in college, I'm giving credit for the image to you, so I hope you don't mind. You can check my page for the edited version of the image, I'm not done with it yet so don't judge to harshly.
Would you please take it down? I'm not really sure what you even wanted to do with it, but I guess by now it should be over anyway.
A few side-notes though: -If you need to store a picture online -for whatever reasons- there are lots of services where you can do so "privately". Posting other peoples work public, especially in a gallery, might not be taken kindly. That's NOT what those galleries are for.
-If you ask for permission, do so -before- you post it and then wait for a reaction. Posting it and asking later...not nice.
-If you give credit, try to link back to the original, the artists gallery or something similar. On dA you can do some formatting, to make the username standout and be a link too. You can read about the username-formatting HERE. (Keep in mind, people may not fully read or understand the descriptions. So putting it in a way it's "kinda obvious", really helps. Like putting the credits at the top of the description, with obvious linking and in short and easy language/pattern.)