This was a pretty fun scene to make, especially the fluffy alien flower which is basically just a more fluffy dandelion. However, my PC did no have fun rendering, for the 4k image I had to render for 9 hours as I had to use 1000 samples or it was too grainy - and even still it’s pretty bad. Denoise struggles with this image but they’re attached as it’s only bad around the entrance of the cave.
Files are too large to directly upload so I’m hoping what I do doesn’t ruin the quality. These are supposed to be in 4K and you can perfectly see the fibres of hair on the plant:
and a close-up of the flower (1080p, 180 samples):
Eevee’s render for a clearer image with less lighting tricks: