Critique:
Shot #1:
The subject (the fish) is moving away from you at an angle. They do that just to piss us off. It takes patience and careful approach to capture the subject at an angle to get at least 50% of the subjects face.
Middle ground (the ocean floor) is a little soft or out of focus. Not a serious problem if the subject were taking up more of the frame. A smaller f-stop may have given you a more pleasing result. At the same time, a smaller f-stop would have required a longer shutter speed, which increases the possibility of camera shake, blurring the whole scene.
The blue water background is devoid of any interest. Less of it would have been better.
Bottom line, a closer shot with the subject angled toward you would have yielded a better shot.
Shot #2:
Ask yourself, "What was I trying to capture?" Take an inventory of your scene. This includes every physical item, lines, colors, shapes. Now, what in your inventory do you want to include in order to capture the shot you were trying? Items that may have detracted from your intentions may include the divers on the left.
Near: The plane is the near. Make sure it is sharp focus and includes everything you want and get it as close to you as possible. You want the viewer to be drawn to it (as opposed to the divers).
Middle: The diver on the right? If so, the diver needed to be closer to the plane, but not in front of it. Middle needs to be darn close to the Near. The diver needs to be almost horizontal (slight angle up or down). Time the shot so the bubbles are not blocking any part of the diver.
Far: The blue water background? Or perhaps the other divers. For a wreck, a plain blue water background is sufficient.
Edge patrol: Carefully examine the entire edge of the frame. See anything? Perhaps getting the entire tail of the plane would have been better. How about half a fish in the upper right? How about cutting off the background divers top of head? These are considerations in getting the shot YOU want.