A little to much bump effect in the presentation. Some bricks have visible conections with other bricks texture / damage wise what and lift the illusion that every brick is a single element.
Your bark is looking a little weird with what looks like the 'plasma noise node' lines going over it but i'm liking the moss feel good and seems to be well placed. Some of the bricks seem to be very lumpy. Its like they have large lumps of mud stuck on them. This is only on a couple of bricks and if it is lumps of mud…
Thanks for the feedback guys! Yes I probably have over done it a little with the displacement in the render :) Probably adding to the puffy look too! The damage spanning over multiple bricks is a problem @Cibo , thanks for pointing it out, I should use a mask to stop this, will get back in to substance and try to sort that…