Monster World II: Dragon no Wana / モンスターワールドII ドラゴンの罠, AKA Wonder Boy: The Dragon's Trap (Game Gear - 1992)
Cover art for the Japanese version: modeling (illustration by Masanori Yoshihawa) (Source: Sega TV Game Genga Gallery)
Monster World IV / モンスターワールドIV (Mega Drive - 1994)
Cover art: modeling (Photo by N. Suzuki) (Source: in-game credits)
Monster World II: Dragon no Wana
Monster World IV