Fantastic work ! Light & Colors.
(Slight feedback,.. the megascan textures look pretty blurry, not your fault at all...it does come across here when I zoom in. I think one way to come around this, is by high-passing the diffuse map into additional bump that will be overlayed on top of their normal. Even add gaussian noise on top of those bump maps.. or procedural noise in 3dsMax, to get back the detail that Quixel lacks, this will give much grittier surface).