Years have passed and the photo sales stats remain almost unchanged. It's impossible to compare objectively which photoshoots sell better etc. It's even impossible to check whether a photo has ever sold or not.
1. Probably very easy to implement. Filtering by photo ID. I want to see the stats for 25-a-day of photos with IDs between 21000000 and 22000000.
2. Probably harder to implement. Filtering by keyword. I want to see the stats for 25-a-day of photos with keyword "fruit" and "cheese" to see which sell better and to choose the subject for another photoshoot.