I'm with you on V4 - I personally like its aesthetic quite a lot. V6 seems to be more photorealistic than artistic, but we'll see how the final version will be!

Aww nice to hear you're using MidJourney on creating illustrations to your book! According to the MidJourney Office Hours update today, the founder David said they're working on the character consistency and style consistency which should be releasing very soon in the upcoming week or so. That will be really useful for you! 🥰

-Bee Lee