I’ve lurking on here for many years but I’ve recently just started suggesting uploading images, but i noticed that out of the multiple suggestions of different images only one gets chosen, can someone explain to me the thought process of what gets uploaded or not ?
Every three to four days a batch of 36 images gets uploaded. A single batch will have a variety of fandoms and a variety of pairings, generally. More popular fandoms (vtubers, Touhou and such) will get more slots (4, 5, or 6, but rarely more than that), and even then the accent will usually be on variety (meaning: different pairings). Smaller fandoms might only get a single slot amongst the 36 images.
If you request, for example, 20 vtuber images, most of them will not be included. If all 20 depict the same pairing, only a single one will realistically get uploaded, because of the aforementioned accent on variety. My advice is to send a small number of images, only a few, every three or so days, and make sure they are all different pairings, and potentially different fandoms. I sometimes saw 4 or even 5 of my requests uploaded in a single batch, you just need to know how to game the system (the system in this case being dpf).
Ultimately, this is left to dpf's discretion, he is the sole decider when it comes to image uploads, and he puts a premium on quality, so you will have higher chances to see your requests chosen if you opt for better looking ones (or alternatively, those that have a really funny or good joke, reference, or a short story contained within).
In general, Dynasty is not really the best place to actually search for images. Because of the very limited nature of image uploads here, you will never get the variety and the sheer volume of content as you will on, say, Danbooru. My advice is to not try and request every single image from every single artist you like, Dynasty is simply not about that when it comes to images. Instead, think of it like a heavily curated selection that gives you a taste, and then you go to other places (such as Danbooru or Pixiv) to fill your belly by looking up the artists that caught your eye here.