They're not insulting the drawing itself, just the idea of reusing a cover already released and making it the cover for a second project.
The drawing is nice, I'm sure everyone can say the quality is good, but the reuse of the cover a second time doesn't really scream "original" to me, and it's not like it's just related to LOVE either, as a broad compilation of eras and songs, the cover kind of oversaturates the link to LOVE when it's not apparent in the A CLASSICAL tracklist.
I hope it comes in a slipcase similar to MY STORY CLASSICAL