Hi Perry,
I'm not sure, but I think you maybe have not got the image size conversion, maybe causing posterisation or whatever. Your images look fine on your web site, but the three here, in particular the one selected by Asher looks 'washed out', highlights blown. I've not found the exact image on your site, but as I said, the ones there do not exhibit that.
Of course, as raised elsewhere, it may be the effect of the white opf background, but I think is in the conversion.
Best wishes,
Ray