Fair, the sitting characters pinkie finger is odd, but the lines are sharp so could be just a bad drawing.

Squidwards arms are slightly at an unnatural angel, but not backwards. Pretty much the same just from the back.

As for the ranger, thainot his thumb, just the higher part at the palm, which is higher and could be emphasized on a cartoon characters to make sure there’s a solid place where palm becomes the wrist. Thumb is on the inside and not visible.

But only one way to know. Have to wait until OP declares the results.