Tweak

Retusche

(slight adjustment or modification)

anpassen

(to slightly adjust or modify)

kneifen

(to pinch and pull with a sudden jerk and twist; to twitch)

korrigieren

(to slightly adjust or modify)

piesacken

(to tease, to annoy; to get under the skin of (someone, typically so as to irritate them, or by extension to enamor, frighten, etc).)

retuschieren

(to slightly adjust or modify)

zwicken

(to pinch and pull with a sudden jerk and twist; to twitch)