I had the same problem after installing it... It turned out that I forgot to set the quality of the terrain textures and scatters to "High" in the game settings... (no facepalm emoji here sadly)
I found that your parts are very well designed already, but if you say that they're not as beautiful as you want, I can't wait to see the result ! If the parts of the DLC could be as beautiful as yours, it'd be great