It's been a long time ago that I emoved the headlamps, but I bet I remembered to NOT use the screws with the springs behind it. Those screws are meant to adjust the beam. You'll find three outher screws to remove the headlamp.
Tip 1: if you pulled the facia off and can't find the middle clip afterwards, look in the footwell Thats why i used kit to glue the clip to the facia.
Tip 2: use vasalinespray to all clips. Especially the plastic ones around the Twizy are prone to break otherwise.