First and last (same pic?!) - In a way I want to like this one best because it shows a crux moment, but I really want to see his whole face!
#2 - This is a good shot to give a client as part of their album, but it won't do for a portfolio. To step it up you need the climber to wear bolder/brighter eye catching colors, and find a way to frame him in front of the distant background instead of the continuing line of cliffs.
#3 - Similar to #2, good shot for an album, but not for a portfolio. To step it up to portfolio quality you'd need ripped muscles showing, a move in progress, and possibly more height.
#4 - Once again, I want to see his face. This is kind of an awkward moment, gear eating climber. No, really I do get whats happening--he had to hold the carabiner to unclip it from his rack and then he had to move his hand to the cam to place it--but its still awkward.
In all of these you really do have the right idea. You are shooting top down or from the side (no butt shots!).
Unlike many conventional sports photographers, adventure sports photographers must work harder and possibly be more skilled than the participants. To get the very best shots you have to be skilled enough to travel with the client AND haul photo gear, AND have the energy to keep up and keep shooting, especially when conditions get hard because that's when photos really get good. For big wall or trad climbing/moutaineering you can avoid lead climbing and just ascend your teams ropes. For sport climbing you'll need to have the skills to anchor a rope and then descend/ascend it at will to follow the climbers and get to the right position for the shots you want.
For portfolio building see if you can get some climbers to go out for free and actually climb for you instead of you photographing for them. That way you can ask them to be in just the right position, pose, grimace, and flex (even though they might be a 5.14 climber on a 5.8 route).
If you don't already, subscribe to magazines for climbing and any other adventure sports you are interested in shooting. These have lots of pictures, are what the climbers are used to seeing, and probably what they are hoping to receive. If you can, find photos of the locations in the picture and try to determine where the photographer shot from, and at what time of day.
Good luck!