3 adjectives to describe enhancement

We follow him through the illustrations, which are, in many instances, a delightful enhancement to the textas he stands there, with his gentle eyelid, coarse moustache, and foolish chin, bringing up Becky's coffee-cup with a kind of dumb fidelity; or looking down at little Rawdon with a more than paternal tenderness.

But our eyes and ears also open to us worlds of independent glory: music and decorative art result, and an incredible enhancement of life's value follows.

The first common peak, 1818, and its ensuing trough came promptly upon the establishment of the characteristic régime of the ante-bellum period, in which the African reservoir could no longer be drawn upon to mitigate labor shortages and restrain the speculative enhancement of slave prices.

3 adjectives to describe  enhancement