I really like your studies, but what i like mostly here, are your environments.
My favor is these one with 3 waterfalls from post #97. Looks pretty surreal i like it
Will agree with Kvetch in some of your enviros you are using very saturated colors - which is not necessarily a bad thing, personally i like it. But it may be received by the majority as something naive.
You may try to add some old masters copying into your working schedule. Should help a lot with learning about how to combine different colors.
Keep it up!, You are on the right track