Which preposition to use with enhancement

of Occurrences 16%

"Mnesitheus!" "Rufus!" "Call me Rufinianus," corrected the latter; "for such is the appellation which I have felt it due to myself to assume, since the enhancement of my dignity by becoming Euphronius's successor and son-in-law.

to Occurrences 2%

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.

for Occurrences 1%

"But you would be even more so without those patches, which may be successful enhancements for lesser beauties but are beneath the uses of Madame de St. André," returned Calvert, bravely, and joining in the laugh which the young girl could not repress.

Which preposition to use with  enhancement