I don't know if this will help but, in case it does, show don't tell is about leaving the reader to work out some things for themselves because that is rewarding to the reader. It's not giving them everything on a plate. For example, instead of saying "Jake felt anger rising inside him", you could describe his actions that would allow the reader to work out that Jake is angry: "Jake suddenly turned on his heels and slammed the door on the way out". With picture books, it's also about leaving lots of room for the illustrator. So the author can tend to avoid describing colors of things (for example), and write more about feelings, scents, sounds, actions, and other things that can't be illustrated very easily.
The more you read other books in your genre, the more examples you will find to help you understand this topic more fully.