I'm studying Computer Science and i am a programmer, so i know how things work with browsers.When i said "download" i was meaning about saving the picture in someone's HDD aka stealing it or using/manipulating it without my permission
So if it's saved on the harddrive that's in-bedded in my computer, it's fine, but if it's saved on a harddrive connected to the computer via a usb cable, it's stealing?! That's really not how the copy right law of the US is written is it. Using it in anyway without permission is a copyright violation. But people simply saving it on a harddrive comes with the territory when you upload a photo for public access on places like DA. If you upload it you've basically already given people permission to save it on a harddrive.
If I where you, I'd reduce the maximum view size to make any download and manipulation of the image useless for any commercial purposes and remove the comment since it only seems to annoy people (myself included) anyways.
The only way to make money from it is to have a sufficiently large copy to work with, which you currently provide.
Say you reduce the online image to 768 x 512px and remove the statement about no copying? Any remake would serve purely personal purposes, wouldn't harm your copyrights in any practical manner, and wouldn't make you look like a moron.