Well some people include what they think is "approximately relevant" keyword and dilute up the searches. :/
You can still search by model I guess, can't you? Open an image with a particular model in it and look at the left panel...there is a section with "More images with this model", if that's what you need?
55-250mm standard lenses. Dual tube macro flash and external speedlit...
I have this exact issue. I actually took my pictures down from ******** because they have a panel on the right that lists the most used keywords on the site. Then the people come in, highlight the keywords and paste them into their photos. What does a fence post have to do with doctors? But in hopes of getting their pictures looked at, they take all the keywords, relevant or not, and paste them under their photos. Not only does this frustrate buyers, but it cheapens and devalues the whole database. Dreamstime seems to have very strict standards on what qualifies a as acceptable image, pixel and focus wise, etc. I wonder if they couldn't institute some sort of standards for keywords. The reviewer is looking at them anyway. One can only hope.
I think there may be some sequence or timing for your photos to appear. Sometimes they may not even appear if you type the right keywords for your own photos. Anyway I feel DT has many photos for buyers to choose from and the licenses covers rights well than some other sites. Prices versus photo sizes are also very competitive. Only the few top rivalry sites in my opinion are on par with DT.
50mm F/1.8G, third party speedlights, 2 x 25mm extension tubes, Nikon...
Using the Advanced search filters may help you get rid of some of the unwanted results. For instance, you can exclude keywords or set the model's ethnicity as criteria. We have not removed any major search criteria from the advanced filter when we revamped the site.
One thing I have been noticing is I am constantly catching Contributors who blatantly copy and steal my keywords. When you go through the portfolios of these bums, you can find additional images where they copied keywords from others. What happens is they end up with a number of keywords that do not apply to their image because they don't bother to check.
Virtually every thief I catch has poor sales. Probably because they don't make the effort to do things right and they may turn off Buyers by inadvertently spamming their own images.
T might help to have a way to keyword by phrase. Right now ifI upload a picture of, say, a scissors lift, scissors lift is an appropriate phrasebto keyword, but a buyer looking for scissors would not want that image.