That does improve the look - I generally try to add more detail to the roofs of my MDF buildings as it does lift the look, and from a player’s perspective you spend a lot of time looking at the roof!
You can get laser cut pages of roof tiles which speeds the process up a bit - but I can’t recall where I got them from - possibly Sarrisa
Perhaps add a dry brush of light grey or light brown around the broken edges of the wall - to show dust - more likely to be damage from stuff falling and generating dust, rather than the sooty effects of fire.