I agree with Gandalf complex is not better, keeping things simple will lead to the best results. Just keep in mind that as you go through wallhaven and see you awesome walls that you DL and you see that a tag could make it better or a tag that doesnt belong do your part and either add or subtract to make searching easier.
However super complex tags that get super defined but are still either general or obscure might not be the best tags to put on something. Just think about what you would search for, if it is something you tend to search for a lot then use your head.
EX. a picture of Optimus Prime standing on the moon.... common sense would say add tags like Transformers, movies, cars, robots, moon, space
however tags such as rocks, black, stars, windshields, wheels...etc might not get the results people searching for those tags are looking for even though they might show up in the picture.
Most of the time more tags do not equal more successful hits. Sometimes all you need is Tranformers, Optimus Prime, Moon, Space, Sci-fi, cars, movies... that about as good as it gets and if you can't find the Optimus Prime wall with those tags then maybe searching for walls is not your strong suit.
Also with transformers you should know if the picture is of the TV show or the movie and use the correct distinction to make. Pictures of the TV should maybe not go under the tag movies as well. Seeing as how the picture will be very very different. But both should be under transformers and Optimus Prime of course.
