At one time, it was very popular to have many Adsense friendly sites. For instance, a web site owner might have up to 30 or more niche sites, all monetized with Adsense. These type of sites were only possible as they were easily ranked in Google Search.
Now, these Adsense friendly sites are not as popular due to recent changes in Google search algorithm. Of course, you are still welcome to monetize with Adsense.
One of the easiest ways to increase your daily earnings from Adsense is to simply increase your traffic. The more traffic you have, the more likely those people will click your ads.
You can pin your photos onto Pinterest pin boards, which should result in highly targeted niche traffic.
This would be a good idea, if you don't have money for paid ads.