Weird shadow

Hi guys, why is my model (apparently correct) is with this scary and suspect shadow? Am I doing smth wrong?

https://preview.redd.it/b530qjmjuwoh1.png?width=773&format=png&auto=webp&s=f823667da68053e53a14ad1e52154e17ee49877d

https://preview.redd.it/09p2clkcuwoh1.png?width=819&format=png&auto=webp&s=b45f23210175f097cde40b8c496a762d6f117c0c