A few comments that maybe help you figure out what to do with these pictures. Since I wasn't there and don't know your intentions with the pictures pls. take them with a grain of salt:
1: Don't know what the subject is. If it's the sky I've seen much nicer and dramatic ones and if it's the mountain in the foreground you need to do more to bring out some details there, and balance it more against the sky.
2: Best of the set, you might try to experiment a little with an elongated aspect ration and the overall luminosity of the image to get exactly the right mood you want to portrait
3: One I don't get, looks more like a failed snapshot as it lacks context and connection between the two hikers, while also framing is far from optimal for a pleasant viewing experience
4: A classic, albeit it lacks some context as you cannot see where the person is looking at. If you wanted to picture an "empty gaze" you succeeded however. Would have aimed the shot a bit higher, or might crop a little from the foreground as not much interesting is to be seen there.
Hope this helps