How Can I Improve My Loras?

I have been using generative ai for about 3 years now but just recently have begun attempting to train my own Loras. I made 2 that were okay, but now I am attempting to make something that is actual quality and I can make use of. I am currently trying to make a Lora in the style of Fortnite/Unreal Engine 5. I have made 3 versions of this, none of which I am very happy about. The first version was trained on about 500 images (some very low quality) and the results were terrible. Watermarks, bad lighting, artifacts, and fuzziness were extremely common in my generations when testing.