Sharon Carter needs to be similar Hayley Atwell/Peggy, a femme fatale. An unassuming gorgeous lady who could break your neck along with confidently handling large guns. Alice Eve is perfect since she was originally in the running for Peggy not to mention attached to play Emma Frost for Fox before dropping out over how terrible her character was in the script. Eve seems to still be in good favor with Marvel as she's also rumored for Amora The Enchantress or another possible part. Alice lived in both the UK and the Sates so she can juggle both accents. She's also going to be better known to international audiences thanks to MIB3 and Star Trek 2 (more action oriented role) next year with possible Doctor Strange/Ant-Man candidate Benedict Cumberbatch.
Alice on Ferguson