Fine Work, Good Piece Of Work
noun
Make something excellent and everyone will call it a fine work. Or make something that sucks and let everyone down. It's your call.
かさく
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
私の描いた絵が佳作で入選しました。
The picture I drew was chosen as a good piece of work.