I love the warm tone you have going on there - it works perfectly with those assets. I only have two suggestions really: little more contrast light-wise (use spotlights instead of a pointlight maybe?) and a little dirtier. The kitchen's a mess and the painting's crooked, so I can't imagine this room's been in use recently so get out your decals and particle systems and billboards!

Also you have a welder sticking through the wall, just sayin.

Nice cave! I'd suggest turning off the collision and cast shadows for the rocks (use a text editor on the .map file to just replace the necessary bits) and just using a few of those pink wall blocks. It'll probably make the area run smoother.
The style you have going is pretty cool indeed - especially the blue light. You could do some pretty cool stuff with the over-saturated colours theme. Or, if you'd rather realism, you could tone it down a bit. Whichever you go with, some light_dust particles wouldn't hurt!

I'd also recommend putting some pebbles and smaller rocks on the ground, some sparse foliage, maybe mushrooms? You can't go wrong with mushrooms :D

There's something floating in the sky and it looks a little odd.
I love the grass and the lighting; it's giving off a bit of a hazy feeling to me. I'm sure there's a more eloquent way of saying that, but "hazy" will do.

Okay, improvements: first off, those leaves look way too stretched. Also, the mushrooms are waaaaaaaaay too big; I feel like Alice in Wonderland! The rocks also seem a little off, probably because they're all a similar size and shape. Other than that, use dirt piles to make the ground less flat - unless we're in Saskatchewan (ha, Canadian jokes). You could also throw in some puddles. I dunno. the whole area feels like it should be wet.