I like the light blue city one better than black and white. I find sky blue very pleasing.
Black and white is a mood. Grey nurseries are a mood.
Have you looked at the "Sad Beige Children" memes? There actually are very nice-looking products and clothes in the pictures, but the pictures point out that this minimalism is an adult aesthetic. Kids are a little more random and usually very multicolored with their preferences.
My nursery was pale green and all the details were on the bedding and curtains. I never found any art that went well with them.
I do like murals. I always thought as an older child that it would be cool to have a fancy muraled bedroom. I would have liked an ecosystem/animal theme or a fairytale scene (but girly/princess fairy as I mentioned above).