If you want to browse further, here is some useful art related web resources.
Google Arts and Culture : One of the most extensive art related websites. It also has high-resolution images of some famous artworks.
ArtUK.org : A catalogue of British public collections. The artwork is from museums and other institutions (including artwork that is not on display). The database is used in BBC Series “Britain’s Lost Masterpieces”
Draw Mix Paint : Mark Cader’s webpage is full of useful information about painting and how to use color. It also has a very detailed video of how to photograph a painting with a cellphone. If you have time to follow the instructions here to submit a painting to The Living Frames it would be perfect (but a bit time-consuming.)