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Depending on niche topic and how it's implemented, an image site might not be the best match for AdSense. People aren't coming to your site to buy something or click on ads, they're coming to look at free pictures and get on with their day. Unless you get a TON of traffic (much more than 400 impressions per day), you may be better off changing your business model or changing your monetization plans.
I've run a huge dynamic image creation and hosting site with adsense for 10+ years and it never did pay for it's own hosting. With 6000 to 12000 uniques per day, it was earning about $1 a day at best. I've actually ignored the site for the past 3 years but some of it is still there with the same $1 a day earnings with only about 600 impressions now. There's really not much you can do with a ton of random images and adsense. Even with descriptive text, ad targetting was very poor. I also found the low CPC plus low quality ads the image site attracted affected all other sites on my adsense account. It wasn't worth the hassle for me anymore so I split that site off and let an unemployed buddy run his own adsense account there for pocket change a few times a year. Relevance and CPC on my other sites are way up now as a result. I think the best solution for an image site where adsense doesn't work is to just remove adsense and use it to promote your own services, software, or other sites instead.
I have a image site, you need a least 10.000 unique a day to see some earnings. adsense pay about 0.09-0.12 per click, with 10.000 unique visits you get about 100 clicks. CPM campaigns are also no hit. Image site dont earn high amounts.
It really does depend on one's niche. Until the great Google image grab one of my galleries earned a minimum USD 30 per day with only a few thousand PVs, in its heyday it could easily do up to USD 100 per day with 20-30,000 PVs.
Ads were perfectly targetted, EPC at the end was about USD 0.40 click but that grab almost killed off that site section so I decided to do it for them. Stupid action on Google's part since it was a unique niche trade reference gallery, nothing exists like it anywhere now.