I think the only thing a watermark will do is keep someone from using it and saying it was their idea. Nothing can stop someone from using the style, colors, or look from a photo, rendering, and using it on their car. If it is that important dont show anyone.
I would put a mark on it, If someone really wants it, they should give you something, even if it is just for the wall, at least something to help the cause.
__________________
James J.
|