You're right, adding modifier keywords like "impasto" or "cubist" have a big effect. There are also some powerful community-discovered keywords that have a huge impact on your results, like "Trending on Artstation" and "Unreal Engine".

My best tips for good results - use a phrase describing objects you'd commonly see in pictures and art, like "House on a hill" or "Futuristic city", add some modifiers, then start with the smallest resolution and runtime. Try a few variations of phrase and modifiers, and see what looks promising. Then pick the best one(s) and use the "Evolve" button to run them for longer and increase the resolution.

How is your experience with re-seeding images to the system going from small resolution to a larger one? When I tried it, results were not as good as starting a high res image from scratch.

Interesting. For me it's worked out well, but it would be worth doing a proper comparison. I'll add that to my to-do list.