it looks cool. but a tad dated looking. you don't need to be so literal with the costume. look at robin. he is called robin but doesn't look like a bird. take inspiration from what you are taking the name from. also, she looks very similar to daredevil. make her your own. make her all black to mix with the story that she can hide in shadows. remove the cowl and add just a mask. make her actually change into a devil like creature. she seems very cool but just a little too much like other characters. you gotta make her unique in someway that will make her stand out. with characters with powers, you can just change the way the power is discharged or displayed to get this, but with characters without powers, you have to step in up to make them stand out.
you have a great base to start from. go in and mix it up. why does a devil have to have red? whats the purpose of the jacket? do you have to have devil or lady in her name? why not just devil or something that personifies the same thing? storm is called storm based of her powers. wolverine because of his claws and attacking nature. storm isnt called weather woman and wolverine called claw guy.
lol see all the little things you can do make make it unique? when creating NeverMinds, we did that. we first started with no codenames. why do all superheroes need a codename? so, our characters go by their real names. i wanted their powers to have a special look to it. nina, for example, has the power to teleport. nightcrawler has the big bamf and puff of smoke. magik open portals. ariel creates them through doors. for us, nina turns into light, explodes, and comes back together in another place. some powers as all the rest but she has a special pattern for it. samanya's human form is not her natural state. the rock and fire form is. she does power up like colossus, she lets herself be herself when using her powers.
see what i mean? make her special. retool a bit of the great ground work you already have started and you can have a very unique, yet familiar character.
Alright I re-made her how about this [link] if u don't like it I'll make more designs for her I understand about what u said I can do a lot better and with Ur help maybe we can bring Lady devil to life