All good points, I'm afraid, but I guess it's something I'll have to put up with.  I've seen the images that have the watermarks through the picture and in my mind it spoils the image entirely.  Posting such a low dpi picture has the same effect.  Why spend hours creating an image then spoiling the whole thing for those who are NOT dishonest to keep those who are in check?  Often this is the only place I post these images--I want to be proud of my work and look back on improvements I've made in time--if I'm going to spoil them, then why make them at all?  It's a shame people have to be like this--when all they really needed to do was ask and within reason I would let them use the image legally.  Such is life on the internet, I guess!