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.