Definitely. Tank Girl originated as a comic book and became quite popular for its unique style and storylines. It has since inspired various adaptations.
I don't think 'Lostt Girl' was a comic book. Usually, if it were a comic, there would be more information available about it in the comic book community, but I haven't come across any such indication.
Sorry, I don't know how old Comic Book Girl 19 is. Maybe you can try searching on fan forums or entertainment blogs; someone there might have the answer you're looking for.
To create a girl comic book, think about what kind of adventures or experiences your girl characters will have. Pay attention to the details of their expressions and clothing. Also, decide on the style of art - whether it's cute, realistic, or something else. And don't forget to plan the layout of each page for a smooth reading flow.
Well, usually it has a female protagonist who is kind - hearted. For example, like in 'Sailor Moon', Usagi is very warm - hearted. And the story often has themes of friendship, like in 'Cardcaptor Sakura' where Sakura's friendships are important.