This is a color edit of an official Classroom of the Elite light novel illustration. The official illustrator for this light novel is tomose_shunsaku.

https://static.wikia.nocookie.net/youkoso-jitsuryoku-shijou-shugi-no-kyoushitsu-e/images/3/31/LN_2nd_Vol_03-11.jpg

To whoever flagged this, colorized images are allowed as long as they're done well, which this one definitely is.