By writing Attach:NPH.jpg on the homage you can then create a link which if you click you can upload the photo. Ensure the photo is about 150 *150 pixels so it will display well on mobile phones, and you have rights to use the photo. The best photo is probably one you have taken!
Please remember to reduce the file size of the picture, otherwise the offline app won't work! The easiest way I've found to do this is to email the photo to myself and select 'image size' small.