The credits of Legend of Kage 2 (http://boxsent075.s17.xrea.com/data/bikou/ds_note/ds_st/kage2_st.html) list 2 artists: Shinichi Nakada, who worked at developer Lancarse & is credited with "illustration"; and Yuko Kanja (神社裕子), who worked at publisher Taito & is credited with "art work". Since the drawings in this site are a close match to the art in the game proper, and that Kanja's credits in other games are primarily to do with logos and manuals, I will go on a limb and attribute these to Nakada, while considering Kanja's work to be the game's box art. Should this prove to be wrong, please correct the tags.