You have most important things correct, right of the bat.
That is feet/character not floating and i did not see any clipping on the clothing.
Now lighting is crucial. Get yourself ILPK pack form DAZ on a sale or wherever you can. Also use a distant light even outside of a building as a sun. Use spotlights inside.
Then you DO NOT need a GTX1080Ti to create very good looking images.
I am going to give you advice now that WILL let you render great looking images.
In the Editor Tab for your Render settings go to Progressive Rendering.
IMMEDIATELY switch off Rendering Quality Enable to "Off"
Start your Max Samples at 500 and work your way up from there. You do not need more than 1500 in most cases.
Rendering Converged Ratio set it from 95% to 98%
Optimizations option you set the Max Path Length to 7
Filtering set the Pixel Filter to mitchell. Then ALSO change Nominal Luminance to 400 for indoor and 500 for outdoor
Tone Mapping set Gamma to 2.1 for indoor otherwise leave at 2.2
DO this as standard for all your renders and work around these settings. I use 3200x1800 16:9 resolution for most of my images and scale them down in Photoshop or Gimp to 1920x1080.
You'll get images like
@ChainZero in no time.
Good luck!
I have just started developing a Ren'py game. I have some programming experience and I'm confident I can program the game, however, I am worried that my renders are not going to be good enough. I have attached a sample in the hopes that I will get some constructive feedback. Let me know what you think. Thanks in advance.