We are currently working closely with a search engine marketing company. They think the pictures on the site are lovely and marketable, we just need to get people to see them! However, if they want to be found they have told us multiple times that search engines will be targeting those with good accurate description and keywords.
Be specific, have the emotional touch, write a couple lines. Whatever you can say about the picture say it. (Make sure it is relevant and important to the the picture).
3 Good examples:
"The sun shines through Cromer Pier and on to the pebbly beach as it rises in early September casting its light on the buildings of Cromer in Norfolk." -Stephen Mole
"The Lancaster and Spitfires from the Royal Air Force (RAF) Battle of Britain Memorial Flight passing over a field of poppies. RAF." James Biggadike
"Finnieston crane and the Clyde Arc. Taken in the final moments of daylight on a very cold day. Typical Glasgow. A very long exposure image capturing the movement of the clouds across the sky. "John Farnan
"Beautiful day at pier"
Don't be general with a sentence or a couple words. Don't write fluff as in write for the sake of writing.
Write the keywords, if possible from most important to least important. Have them relate to the description above.
Hopefully this helps you all in the future.