I stumbled upon the War Graves Photographic Project (official site) recently and considered it worth a mention. The aim is to undertake:
the immense task of recording, archiving and making available to the descendants, images of the graves or memorial listings of every service casualty since the outbreak of the First World War.
Whilst it appears that no photographs have yet been submitted you can view those buried at Hoylake Cemetery (Holy Trinity) by clicking this link. Of course you’ll be able to search for other local and national cemeteries. Do let me know if you subsequently contribute to this project.