Complete stylised graphics rewrite
OK, someone had to say it.
The graphics on TPV were always placeholders. When the resource is in place, they should be re-built from the ground up.
My preference would be to go for a stylised low-polygon approach, which allows for scalable graphics across the wide range of hardware options, with flexibility for cool animations and effects - it's also different to the other platforms out there. Whatever is chosen, it should have a consistent style.
I've attached some examples for reference.
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Brann mac Finnchad commented
Please improve the views on the climbing island to actual scenery. Personally, I spend 6mo of the year staring at white and brown scenery IRL. An attraction of Zwift in comparison to TPV is that there is colour, and greenery everywhere. It helps with the SAD.