I will make a very brash and harsh comment, but very superficial-
the 1st 2 images have too much bloom...
well, unless you were going for a fog look...which in that case, they look perfect.
The other 3 look photo-real, awesome!
Win 10 Pro 64, Xeon E5-2687W v2 (8x 3.40GHz), G.Skill 64 GB DDR3-2400, ASRock X79 Extreme 11
Mobo: 1 Titan Xp, 1 Titan X Pascal
External: 6 Titan X Pascal - 1600W EVGA T2
Plugs: 3DSMax, C4D, Daz, Houdini, Lightwave, Sketchup