It's up to the voters to decide. Just try and do your best. To be honest, low-effort posts such as the one with just the funny faces will not earn earn as much as the good sexy posts that you used to focus on before.

It's not the selling part that alone makes people not want to upvote your posts. There are other content creators here who sell. Content quality matters the most. If the image quality is good enough and if you have a good idea for a shoot, then you can be successful. Since you're doing photography, it will always be useful to think about taking good pictures. There are volumes of books written about photography and modeling, some of which you can borrow from your local library. Study that and perhaps you can find a source of inspiration. You need to constantly evolve. As the number of authors increases, there will be more competition over the finite reward pool.