Thanks for your feedback.  I was thinking about a small brand logo bottom right or left of each image.  Nothing instrusive.  For the feeds it would be clean images.

Thanks again for your thoughts.

I am in the process of creating new images for my products to use on my website.  Are there any advantages or disadvantages of watermarking each image?  Is there an SEO impact good or bad?  I am aware that filename and Alt tags are important, but am unsure if google dislikes watermarked images.