Hat of to you for getting this far

Lower the volume fog is the first thing i'd do. Push the brightness of the house walls really give them a kick, desaturate the grass a tad, maybe the bg to.

Now is the time for you to do the fun bit of the comp, play with everything and see what pops out at you. Go radical over saturate over expose push everything till you see the look you're going for. Just have a go see what's possible.

Well done
Dave