Despite knowing there are plenty of articles already published on this topic, in DT, I just couldn't stop myself from sharing a few points. In my last blog article I wrote this: "If your keywords are not relevant enough your wonderful portfolio is not going to work up to your expectation." Also the same applies on category selection as well.
This was my first image to be sold under a W-EL license. When I was uploading it, I was really confused regarding who might be interested to buy the image of a bunch of keys? Real estate? Banking and finance? Career and Success? Security? There were so many target buyers, yet three categories available.
I know that it is not only I who might be dealing with such images that have plenty of scopes and applicability. The best way is to do a little search and find which categories are in more demand. That is, images under which categories are greater in number and sell more than others? Once this sorting is done. You have two choices left. Either pick up the best three or the bottom three.
Why best three? -Simply because there is some assurance that a greater number of images sell well in such categories. And therefore, there is a probability that yours would sell well too. But there is a risk of facing a huge number of contenders and getting lost under the huge bulk of similar images.
In this case you can grab the bottom three categories which are less visited by buyers. However, since there is a fewer number of contenders, there is a greater chance that your images would get viewed, and even sold, if liked by the buyer.
Let's come back to my image. Here I have chosen three categories: Security, Isolated, Home related. I tried my best to keep them as versatile as possible, so as to grab a huge section of buyers. Once the categories are done, key-wording becomes an easier job. Now become a buyer who is looking for an image that relates to SECURITY - the first category. Which keywords would you use if you were looking for images that relate to SECURITY? Try them and find how many existing images are already listed under those keywords? This way you can pick up each category, pose to be a buyer, and find more appropriate keywords.
You can also add more keywords that don't belong to the three categories if they are already in your mind. There is no harm in trying and adding as many keywords as possible. Also remember that all buyers are not strong in English. While searching for an image they won't be using complex terms. So, it is always safe to be simple and specific.
I am not trying to say that there is some relation between keywords and categories. I just tried to suggest a way of adding more successful keywords by using the "Categories" as a useful tool. This worked for me. I hope they would work for you too. Have a good luck with your sales.