SDR
Honestly, painting complex camo schemes and the like in that scale is a futile endevour (IMO). However, with that said, I get it! I'm finishing up a platoon of IV's and I did a typical Normandy (ish) paint scheme. Once I got done with the decals I was ready to weather the tanks. I had a row of pigments and fixture all ready to go. I got up from the table and told myself "I'm going to see a lick of this weathering from a couple feet away"

Still, we want our toys too look great! Your Firefly looks awesome by the way. I'm guessing your getting ready for some post Normandy fun?
As for terrain, I'm not a huge fan of making any of it. I've purchased most of my terrain only have to paint some of it. Making my own trees, but what I'm going to do is use a bit of green felt, texture it a bit and use it as a forest outline putting a few trees in it for aesthetics.
The thing I dislike the most is painting infantry in 15mm, but again, you aren't going to see the detail work on them from a couple feet away!