Here are some simple guidelines, based on your valuable feedback, to get the best possible results:
High-quality images = better results
Avoid overlapping clothing with palms
Keep people in the photo from being too close together
Less clothing usually produces better results
Avoid complicated poses or rotated/flipped/cropped images
Avoid using photos of people wearing black clothes
Warning: Do not upload any photos of celebrities or children, otherwise you will be held fully responsible for the consequences.