Well the site is on my priority list to redo when I get a spare $1K for a software package made for the purpose.
Frankly, if I'm losing business over visitors impressions of the look of the site then I'd have to say that's a problem I will never be able to resolve because it's subjective and there will always be those that do not care for it.
The site is designed to be highly functional and intuitive to use. If it lacks in anything it is some attention paid to SEO because the images do not show up on Google Images although the same images which we've licensed to major players like Shutterstock and Fotosearch do show up under their name.
These days the problems are many and varied when it comes to selling artwork. My returns are much higher taking a royalty from major players, who charge substantially more than I do, than in marketing my own collections and sites.