About Thumb

Hi,
Can you please attempt to give a single/couple of lines(summarzing) on what do you get from the different parameters of thumb:

- Large thumb/small thumb(w.r.t. thickness)
- Long/small thumb( w.r.t. length)
- High/low set thumb(w.r.t. position)
- Flexible/non-flexible thumb(w.r.t. flexibility)
- Wide angle/narrow angle thumb(w.r.t. angle of opening)

Its so confusing to read a thumb, the pivotal finger .
At most, I see that - its the manifestation that a will power can cause.