Click on Profile;

Scroll down to Photo Gallery;

Click Edit;

Select the photo you want to delete;

Click Delete photo;

Then Save; and the photo will be deleted from your profile.

Tap on the three horizontal pink lines [☰] in the top-left corner;

Then on Settings;

Then Manage photos;

Select the photo that you want to delete;

Tap on the three dots [⋯] (either at the bottom-right or top-right corner);

Select Delete; and the photo will be deleted from your profile.