I came across this site a little while back. It's an online photo showing platform with both free and paid shows. It can be kind of hard to get your head around first. You have to make an account, upload your horses and then you can start entering them in shows. Field of Dolls has done a good post explaining it https://fieldofdolls.blogspot.com/2021/08/omhps-online-model-horse-photo-shows.html so I won't try and write it out when you can have her awesome explaination.
Anyway if you are after more shows to enter this is your site.