Wow what a difference! I think it looks great and well done to your DS for picking out great colours. I think it's important for kids to have a say in their rooms afterall it is their space and somewhere where they can chill out, play with friends, read etc. It really is the only place they do have a say!
When we moved we told the kids they could have whatever they liked in their rooms (Mum tries to give a bit of guidance

) my then 6yo is very head strong and all she wanted was a pink room. I took her to the paint shop and she picked out two pinks and wouldn't budge on them

I painted her room and she loved it, thanked us for weeks and weeks for doing it. Her Dad and I needed our sunnies for the first few weeks but I'm use to it now. She even made a sign for the door saying "Welcome to the Pink Plarza" yes that is Plaza with an R in it
I hope your son is enjoying his new room and yes hope he keeps it clean for his Mum!!