I don't want to call it a 'comeback' (he's been here for years) but Haritama Hiroki's Comiket 79 release Mile Stone is probably the first illustration collection I've seen from him since his 2004 art book Splendor. Though the works collected in Mile Stone aren't all new, they bridge the gap between between his last publication and the present.
Splendor: Haritama Hiroki Color Art Work Collection is a rather uniquely made book, and perhaps even ahead of its time in design. Though Haritama Hiroki is a rather prolific artist, his name might not be immediately familiar as his heyday was in the early 2000's. He's best know as the character designer and illustrator for the games Ensemble and Natural 2 -DUO-, and art work from both of those can be found in Splendor.