decorating question

Here is a plain jane wall in my lounge room. I want to add photos to it but I also want to keep the Singing Cats. It’s a really collectible piece, the artist’s sketch of the endpapers for the Cat in the Hat songbook. This is an important book in my life because at the age of six, I taught myself to read music in order to play the songs in this book. It didn’t seem like a big deal at the time but now I’m really proud of that little kid for teaching herself to read music. In learning, motivation is everything.

I’m motivated. School me on wall decorating. Not sure it comes through in the photo but this is a midcentury modern house, built in 1961. Color or black and white? Various sizes or all the same? Scenes? People? Both? Frames? Mats? More hand drawn art? I’m all ears.