Yoast Plugin For SEO

I have the Yoast plugin installed and am trying to optimize images…when I tag images, should I actually use one or two “keywords”? For instance, my entire site offers cartoons (it’s an image licensing database) so if I have a medical cartoon pertaining to a doctor in a certain image, should I tag it “doctor” or “doctor cartoon”? see my sample URL for example

  • OR - see a specific image in that catalog such as