Depends if they are your images or not..?
If yes..add more "descriptive" text..describe it to a blind art aficionado :)
If not your images..ask your artists / uploaders to give you a short text description of between 50 and 250 words ..tell them you may "edit"/ "rewrite" slightly..and ( if you think it is feasible to do so ) that you will let them see the edited / revised version before it goes live..
I have sites which are predominantly image based ( my photos and artwork ) I have always had around 50 to 250 words description or subject related text with each image..sometimes more ..no problems with any updates, including the black and white animal ones..
OTOH..if you wish to do well in image search ( I block G from hot-linking ) from what I see of others longterm success there ..better to use short one or two word actual image titles..