You've done some simply put, amazing Magneto customs before. I don't like this one all to much though. Superb craft as usual but the head looks way too small for the body and I think the ML Bullseye is a better sculpt than the Capitan Marvel body, so I liked your oder Magneto better. the Sentinel is neat!
It still looks just like a red Psyloke to me. Great idea using her as a base but you need to make it more Elektra. it should be super simple though, all you should have to do is swap the heads with the ML3 Elektra (which wasn't bad and it has the necissary bandanna) and attatch her sash/skirt piece from the ML3 figure and it should be perfect.