We've been playing around with using repetition in Midjourney.
The jury is still out on whether it makes a huge difference or not, but here are a few examples.
Each image is captioned, but the order goes like this:
first prompt is single word
second prompt is that word repeated multiple times
For fun, I also tried Creative Fabrica's Art AI: Spark. I would have tried Jasper's, but I cancelled my subscription (thanks, ChatGPT+Midjourney, for saving me $100+/mo!)
Obviously Creative Fabrica is an amazing clip art resource, but their AI has a long way to go to compete with Midjourney.