Often times I get asked to fix and/or add the finishing touches onto renderings that have been started already by someone else. This is especially true for renderings that rely heavily on landscape design–which the renderers (not being designers or part of the design team), struggle to get right. Also, most outsourced rendering firms rely on using 3D model plants, which can leave the renderings looking stiff and un-dynamic. A little work in Photoshop with real plants, entourage,  and textures goes a long way to get the visualizations to the finish line.