When it comes to your discoverability on 500px and submitting your images to Licensing, keywords are key. To stress the importance of keywording your images, we have improved the Suggested Keywords feature, found in your Photo Manager and the Uploader. Suggested Keywords are meant to assist in the upload process, making it easier to select the right types of keywords to add to your photos, ensuring higher discoverability.
Depending on the image you upload, you will receive a handful of suggested keywords underneath the Keywords box.
Simply click on the Suggested keywords and each one will be added to the Keywords box.
Of course, you can always add your own keywords in order to reach the 30 keyword limit, but it's also a good idea to review the Suggested keywords and select a few that apply to your photo.