A good backscene can really help to give a layout depth, whereas a bad one might do the opposite. The trick is for it not to dominate the layout because that’s what you want people to look at – unless you’re an amazing painter and want to show off your skills.
When painting backscenes, don’t use colours that are too dark or rich. They will draw the eye towards them. Muted, hazy colours are the key.
Even off-the-shelf photographic backscenes are very saturated and heavily detailed, drawing the eye towards them. For these, mist over Halfords white aerosol primer from a distance to produce a hazy effect and thus make the landscape look further away.