You might find something you like in here : http://themeforest.net/search?utf8=%E2%9C%93&category=wordpress&new_term=landing+pages
with most Wordpress themes you can customise a lot of the things you want .
For wordpress related themes have a look here : http://themeforest.net/category/wordpress/nonprofit/churches
you can easily customise colours on some of the themes on there ( some of them will have an option in the admin panel to do that ) . If you pick a responsive theme then it will work on most mobiles and tables.
Good luck with sales you guys. Google Suggest ( US based searches ) shows up the following suggestions
- adobe muse templates for photographers
- muse templates portfolio
- muse templates photography
- muse themes portfolio
I would love to see some items around photography and portfolio niche.
This should cover all the basics : http://codex.wordpress.org/Using_Themes#Using_Themes
I think the table wp_postmeta usually stores the meta data from posts .. you can have a look in there.http://codex.wordpress.org/Custom_Fields#Implementation_Details