As far as your subject goes, you did the best you can with what you have; which is great. I also like the choice of a shorter, long exposure and Before I break into other points, what exposure mode were you shooting with? Are you manually metering/exposing or relying on one of the semi-auto modes?
When shooting mid day, as it appears you were doing here, I would always recommend taking a moment to consider whether the sky is a necessary component of the image you're trying to create. Shooting landscapes is a constant trade off in contrast and lighting, since those variables are largely outside our control. Here, trying to maintain the sky (which is mostly highlights here) led to severe underexposure in the primary frame of the image and your trees/rocks are way too dark and lacking any sort of detail. Typically, you want to expose for your main subject and sacrifice some of the other details in the image.
There are several, different approaches that could be used in situations like the above:
1. Meter on the rocks of the fall, blowing out the sky and accepting that or attempt to recover some of that in post
2. Bracket shots (3 shot bracket) and blend in post to maintain highlights, main exposure and shadows
3. Use graduated filter (reverse grad here) to reduce the exposure of the sky before taking the shot
4. Decide to frame in such a way to reduce/remove the sky from the image (don't believe that would have been a good option here, as the tree line is a good piece of "interest")
In general, it's better to go earlier/later in the day, when the light is softer and front lighting your frame a lot more; that way you have a more even exposure and less of a gulf between your highlights and shadows. It makes getting your whole frame exposure much, MUCH easier. Mid day shooting is generally a struggle and only really good for practice vs getting a "shareable" result.
If you are ok with it, I can post a quick and dirty example of some edits to address the contrast/exposure points above just so you can have an idea where this image could go. Did you shoot this as JPEG or in RAW? It looks like you should have enough detail retained in the original to make some fairly decent updates to editing if you want to. It would give you some jumping off points for future shoots to have some vision into where your settings will land you.
You definitely look like you're on a good track, just need to keep practicing and experimenting. Don't worry about "posting too much"; take advantage of the folks around here to help with your learning and keep going!