Are you sure this is Marina? Her hair and eye colour looks different compared to how yam-yam usually illustrates her.

Can't read the kanji, but the katakana says Marina.

The name of this C75 manga/book/doujin is Injoku Marina and this is very likely an original character since there are a few other OCs there (although it IS a Gundam 00 manga with Marina Ismail)

Marina Ismail is in full katakana (マリナ・イスマイール) and this is indeed different from both her official appearance and the way this artist draws her.