@mirjam_diala Another thing that might work
for your setup is a ring light:
https://www.amazon.de/Neewer-Ringleuchte-Licht-LED-Ringlicht-Bluetooth-Empf%C3%A4nger/dp/B01LXDNNBW/ref=sr_1_8?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dchild=1&keywords=ringlicht&qid=1630417167&sr=8-8