Thats your LOD / probably a bill board or an impostor.
an impostor will always be different from the rendered item, since the light will hit the real tree a certain way, while the billboards usually have no light/shadow at all.
If your light is static you can update the material with a better render to get a closer look.
If you are dealing with a dynamic environment you are sort of stuck to the best you can get.
that, or don’t use impostors if your target platform can afford the cost.