I keep seeing this comment coming up about signing your work, and like I have said before, If I buy a print or painting I want the artists name or identification on it. The identification is part of the history, and is handy if you want a similar kind or style of work, everyone on this planet that has anything of value will have a trade mark on or a brand mark. Watch your local antiques show on tv, and listen to the comments on valuation of a print or painting, it goes something like this "If only it was signed, it would be worth so much more". I believe that if it is done discretely, it should add to the value and interest of your work. Look at it like this, you can go out and buy shoes, a handbag, a t-shirt, golf clubs, you name it and all are classified as better because they have the brand name, logo or label on.
I would go further if I was a photographer, I would also add gps coordinates.