Since I am here replying anyway, just wanted to say these are fantastic images :) They don't come across to me as dark and creepy. Of course anything with skeletons has the sense of death to it, but this is juxtaposed with the bright cheery lighting, and also with the fact that both man and horse appear to be still alive as skeletons, since they are both still doing things, taking the edge off the sense of death and adding an almost light-hearted feel to them in some way, not quite comical but definitely slightly humorous. This also matches with the skeleton smoking a cigarette since... no lips, no lungs, no way that could possibly work, yet here we are :)
Then there's another offset there, away from the light, breezy, and fun, which is the contemplative nature of the skeleton looking at the photo (of what we now know is a painting). What is the skeleton thinking? (With no brain ;) ) Is this an old love, a family member? Are they missing them? Is it themselves in an earlier time? And interestingly it's not a photo of "back when we had full bodies", it's a photo of a skeleton again, which stops things getting too dark there.
BTW I love how the horse is looking up and in for one photo, and for another it is drinking from the bucket, further strengthening the fact that these are not creepy dead things but still alive and moving around. So yep for me, I don't get any strong dark vibes from this at all!
And the render quality is beautiful, from light to materials :)