hmm, just looks like the stone need more displacement and bump up the fresnel levels for a little more shine, for overgrown look, R&D has some nice plants for hedges that look overgrown orrrr, just make spines where you want the overgrown headges and scatter some bushes between the hedges you have now makes it look like the Gardner too leave for a year or ten. for pavers with grass between, thats tricky, unless you have geometry in between them to scatter along some small grass or if its just a texture simply add grass to the texture in the cracks of the texture itself and add displacement, not soo good but. if itoo also has the option to scatter using your bitmap alpha image that would be good so it will only scatter in the grout section of the tile map, just some tiny grass maybe, its how i would go about it but the gurus will know more and o yes time, its the issue for sure