The bottom left side of the social media cover photo is usually blocked by the profile picture so that area should be clear.
The logo on the banner can be removed, as it is already on the profile picture.
Let’s go for a clear picture of the cover girl. No need to add the sentences I suggested. Please find attached the current Twitter banner as an example.
As for the slider picture, Option B looks better but we could remove the logo, as it is on our website already.
We need to be consistent with the other pictures so it should say:
Bigger message: Register to Meet Top UK Universities
Button: View our Events