I appreciate that. I guess you don't need to play this game for joining this contest but I highly recommend you to play this game. This crypto game is super fun.
If you wanna join the art contest all you need to do just go to the Splinterlands profile and search for art contests post. They organize a contest once a week. If you read their post you will understand everything how to participate in the art contest. What requirements they need.
And you will find Splinterlands characters on there official website: Splinterlands. If you need more help you can ask me. I'll try my best to answer your questions.