Pic 1, possibly clip all but the left branch, possibly gin the right branch.. would need to see alternative fronts before taking action.
Pic 2, very straight. Tilt during report to increase interest, id remove/ reduce branch on the right and rotate (tip) it that way to make the large root on the left more prominent and a larger interest point- if roots are available possibly add a rock underneath and root over rock
Pic 3, hmm I can't tell much from the image here, I might plant that outside and do a few partial defoliations possibly full over time until the plant develops something that catches my eye...
Pic 4, definitely my favorite of the group, needs wire. Bring the left branch down more and reduce the apical candles to allow lower branches to grow stronger.