Rotated Die Error: How To Analyze? When Does A Price Premium Attach?

Yours is rotated. Nice find! I would think at least 90 degrees would pay the larger premiums.

1) I'd say that you call it CW or CCW up until 180° in either direction. You could technically day a 90° CW is a 270° CCW, but I think that's silly. I think you measure how the reverse relates to the obverse.
2)I think it is impossible to know which die was rotated. The same results are achieved by both options. I do believe that hammer dies tend to rotate more so than anvil dies.
3) No clue what you mean by the question, but the term "clash" does not apply to you coin. (Unless in addition to being rotated, it is also clashed)

Your photographs are fine. Many people here use their iPhones.

In general, it is not a matter of direction of rotation, but degrees of rotation. Anything under about 20 degrees is pretty common and doesn't attract much attention. Getting to around 45 degrees will command some premium. At 90 degrees they become collectible and there is a list of known examples.

Even so, they aren't usually super expensive. I recently bought this 1982 Lincoln, 180 degrees off and in MS condition slabbed, for $50. It probably cost the person $40 to get it slabbed.

Thanks all for the feedback!