There is a few differences between the renders I can get with Blender and the renders shown in the video lesson. I don't have the GI or the Reflection renders, but I do get Glossiness and Diffuseness. So, I hope I can get comparable results just using that, or I'll have to find a new way to render this scene for lesson 4. I've also changed the mountain and instead of bringing an OBJ from World Creator, I used a displacement map with more resolutions.
I also created the sky using the Pure Sky addon from Blender. I thought it gave me better results than using a stock photo. Also, the advantage I experience using a Sky inside my 3D environment is that the light already matches perfectly with it.