Wink, I'm not qualified to be a photo judge, either. The thought of doing so scares the hee-bee-gee-bees out of me, in fact.
With that said, entering photos in contests to be judged according to a standard is a great way to learn how to improve your photos. Moreso than attending a judging/critique session, which is also means to learn to improve your photos.
If you want to take a step further after you experience the former methods for a while, take a(some) course(s) in photo judging. And/or find a judge that is willing to discuss photo judging "rules and rationales" with you. Either one should benefit your photography knowledge if accomplished with an accredited judge.
Entering competitions and listening to judges can be of great benefit and a great place for learning, i have always found listening and watching has had such great benefits irrespective of if i felt the judges were on point or not.
Joining a local camera club even on line can help enormously.
I have been judging competitions in our own club as well as external clubs, i enjoy the experience and always learning, there are some basic principals to abide by be it judging or making a photo, these are learnt when doing the a credited course by recognized photographic associations.
Joining competitions internationally or on line especially needs to be done with caution, only enter fully accredited competitions, there are competitions you pay a fee to place your entries in and you may receive either acceptance or certificate distinguished result or a silver gold award, a certificate is mailed to you and may very well be from some one using a lap top in a remote foreign location operating in their garage or bed room collecting entry fees globally.
Being a member of the PSA (Photography Society of America) is handy, it filters out the scammers.
The judging of an image or creation of an image should be consistent,
A image needs to meet the criteria rules set out and be fitting.
A image should engage the viewer, tell a story, or provide a message a connection, evoking emotions.
A image should be technically proficient, but not totally overrule the power of the story.
A image should have a WOW factor.