They all feel empty, sterile, cold. As you stated missing something. I am not a landscape guy, but remember that photography is a form of communication ... in many/most ways no different than the written word. Often it is helpful to think about what you want to say before you release the shutter. #2 is my favorite. It says loneliness, empty, void of people, end of the road, to me. This fine fine if that is what you desire to convey. The other say empty, but in a no so good way ... empty as in a mistake was made and you forgot to include something. Look for a subject that you can isolate or highlight/emphasize through lens selection, camera position and/or camera setting. In the bottom images, to my eye, the main subjects are posts and rocks ... but you treated them much the same as the the remaining elements in the image. By not isolating/emphasizing the rocks and posts you have them competing against the other elements in the image for the viewer's attention. This distracts and diminishes the viewer's attention. After a glance, the viewer says to themselves ... I don't get it, what is this photo saying?
If you're using the posts/rocks/road as framing elements ... then you need a subject for them to frame ... in your case most of what they are framing is, more or less, uniform background. If there was a strong landscape element in the image the framing would work to your advantage.
In the end of the road image, (my favorite), the rocks in the foreground compete against the message I glean from the image of loneliness/emptiness, which is focused on the bench. Had you moved to the right, you could have eliminated the foreground rocks from the image and from competing against the bench, (and the message I get), as a focus point attracting the eye of the viewer away from the bench.
Don't be afraid to get low and shoot up or up and shoot down, explore all the possibilities of adding 'adjectives' to the story that you're telling through photography. Attention to details will often add greater success to your images. Example, in the last photo you have that shade structure to the right ... it detracts from the rest of the landscape. In the next one up, you have cars to the right and the red post in the middle ... again more distractions. Often, when shooting the beauty of nature, it is best to keep man made elements out of the frame.
Good Luck and Good Shooting,
Gary