As for the image it is quite nice... a bit more contrast would help I think...
I would say that using ready made content is not a crime... The Evermotion sell it, they have collection of 60 or more volumes of ready made content for archviz. If you buy them, sure you will take advantage of good and detail modeling of trees, cars and other stuff... That is the overall course of this industry... The new and better content appear every day...
The one whole industry live of producing the archviz ready made content...
However, there is ethical question that rise with it, and it is about setting the line between using ready made content and using ready made work/scenes...
When I competed at AVC, the theme was natural environment and I had no ready made content whatsoever... no detailed 3d treas, no textured rocks, no ready made water, nothing... I did it all by myself... modeled and textured rocks, palm trees, used stupid max foliage and retextured it and so on... Yes, I learned a lot then, but would I do differently now? Probably would, as many of the people do that, one have to keep up... Evermotion models are high quality and very detailed and they are raising standards in our job...
Personaly, I like to model my own content most of the time, especially furniture. I would love to have time to model plants and even cars, but as all of us know it is tedious and very time consuming task for which we do not have time. I did recently the house exterior with trees added in Photoshop... most of the critics were addressing that, so I figure, I would do better with 3d trees, but thatn you need best quality to look good and what to do? Reach for Evermotion...