Not a bad concept so far, a couple things to note are that, if you look at your moodboard, a lot of the characters have large defining features, and/or a signature object that adds to the design. If you want your character to come off as 'badass' think about what defining features she should have to come off that way. Eg. Does she look ready for a fight, does she look dangerous, etc.
A few things you could do to enhance the silhouette is make better use of her trench coat by making the base of it broader, like the assassin from the top of your moodboard.
Hope that helps, keep working at it and it should turn out well !