Your lighting is great, props are well thought out and your photography is lovely. Keep doing what you're doing!
I think a lot of this boils down to keywording, titles, tags etc. And of course, using every avenue you can find to get the word out!
I wouldn't search for sunny yellow coffee mugs, but I might search for yellow coffee mugs, for example.
Maybe others can chime in, but I think your photography is not an issue in the least. I think you will have better luck working on promotion, and relevancy (great article on relevancy here:
http://www.etsy.com/teams/7722/business-topics/discuss/9253397/ )
Hope that helps a bit!