Hi, thanks for sharing. Those are really good renders for someone who considers their skill 'Basic', but hers a few suggestions that helped me improve and I hope will do the same not just for you, but for all future developers moderately familiar with Daz3d, who are making new games and have stumbled upon this thread, or just amateur artists like me who want to improve their Daz3d skill.
1. LIGHTING- This is pretty obvious. Everyone knows that you can't have an attractive scene without the use of good lighting, but most of the artists/developers who release a new game do so with renders in which they have overlooked the importance of realistic, accurate lighting. Your samples, though decent enough in posing, props etc, seem a little bland and basic because the scenes lack the depth created by real-life volumetric light. Take the bar scene for example. Most bars are never that brightly lit, and more importantly, almost all indoor areas in real life have dimly lit or dark regions. I suggest improving your knowledge of shadows and lighting by creating and playing with your own custom-created spotlights/point-lights, or even (if you wish to show daylight) distant lights. Maybe look at some actual photographs and try to recreate the lighting in your own scene.
2.Character Detail: This may not be as important as the above point, but it's the little details like these that will make your renders standout from the crowd. This is especially noticed in close-ups of characters. Forage the internet for any high detail, HD morphs for your characters, and make yourself familiar with them. A good example is 'EJ Face Morphs and detail' by EmmaAndJordi, for gen8 characters. Here's the link.
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3.Cinematography/Camera-settings:
Very few people pay enough attention to this, but for the ones that do, the results show clearly. Things that may seem utterly insignificant to a new Daz user are sometimes the secret tricks of the trade of experienced artists. Sorry if this sounds a little far fetched, but when creating a scene, is it such a bad idea to think of ourselves not just as an artist creating a painting, but as a cinematographer of a movie, with your chosen Environment being your set, and your Genesis characters being your cast? Where you place your characters, which areas of your scene are empty and which are not speaks a lot about what you are trying to portray. Once you've created a basic scene, don't avoid the camera settings, such as frame width and depth of field. A few extra clicks can completely elevate the realness of a scene to the next level.
These were just a few things that have helped me, personally, and I'm not guaranteeing that they may work for you,or for everyone else. If not, I sincerely apologize for having wasted your time. If they do, I'm happy to have helped. I hope you can apply these suggestions in your renders, and create a beutiful, visually-appealing game. Best of luck!