I find it best to evaluate trees in sections before trying to view it as a whole.
First check the roots to find where the nebari looks best. Roots will also give you the best trunk angle (where best roots are horizontal)
2nd check the lower trunk to see which side shows the best exit from soil, best curves, etc.
3rd check branches, especially lower branches to find which side gives the best view.
4th check any faults - things you would rather not look at which should be hidden at the back or covered with foliage.
5th Any features you really want to show off - shari, interesting bends, etc.
Finally try to combine each of the above elements. It is rare to have all the best features on the same side of the trunk so it's usually a compromise between the best view of each. Bear in mind that different species have different aesthetics - nebari is not so important in juniper bonsai but very important for maples. Also most of the upper branches can be moved or regrown.
You will probably still be overwhelmed with different choices, especially with these junipers as they usually have lots of possibilities. In most trees there are several viable options to develop different shaped trees which leads to indecision and procrastination as we are terrified of making the 'wrong' decision. Change of mindset is required. When you see several possible options and cannot decide which is better that can only mean that all are viable and that means it does not matter which option you choose. Masters have learned to just make a choice so it seems to be almost magic when the go straight form evaluation to decision. If you can't make a final decision try tossing a coin. Whichever choice you make is the correct one. Not making a choice is the worst option as the tree will never develop its potential until you make that choice and get on with bringing it to fruition.
