Currently there's two tags for the same character: jewel_(mamonomusume) and lamia_hygieia. I'm not familiar with the VN, so which one is the proper tag to alias to?
Regarding the title tag, mamonomusume_to_no_seikatsu_~ramia_no_baai~, the subtitle -- the part surrounded by tildes -- is unnecessary, since it's there to signify the monster girl in question. (Other than the lamia, there's also another entry in the series starring a plant monster girl called alraune.) It should be shorted to mamonomusume_to_no_seikatsu or mamono_musume_to_no_seikatsu; if it means anything, I've seen the title spelled out as the latter more frequently.
Updated by jxh2154