Falling Leaves

I think mountains are the best so far in this painting. The big dark tree on the left is awesome.
Composition is a bit strange as there is no foreground. You can add it like in your painting Mountains. I think the key to the mountains with Bill is that he uses lighter base color, thus getting better aerial perspective. Also rugged shape looks very nice rather than just simplistic triangles. I hope you learnt something new from Bill. Best thing about Bill, that he explains light behavior that Bob really does not. There are pros and cons with each video guide, especially when it has to be short like 30 min.

Thanks - I'm improving at bushes and definitely like the lighter base color on mountains like you said. I still struggle with water lines and shores but I'll keep working at it. Thanks for your feedback!

One advice for the shore lines - keep the shores more horizontal and keep highlights more horizontal. There is a nice piece you created here on the far left that has land horizontal and highlights are horizontal. More of them will give more natural look to the lake.
You can try to do land with knife in the way you did water ripples here but just along of shore line. And then apply highlights.
Of course there are many different shapes for the lakes and other water bodies.
Here is the link to two examples however in both you will see that land want to lay more horizontal.

https://media.deseretdigital.com/file/6a54f00024?type=jpeg&quality=55&c=15&a=4379240d

https://c8.alamy.com/comp/RWJ6TG/colourful-alpine-lake-with-mountains-blue-sky-and-clouds-in-the-background-british-columbia-canada-RWJ6TG.jpg

You are on the right path, keep going, there is improvement with each next painting and a lot of learning and joy.