Anything I Wanna Write
Now this is really tricky, people will try to find 8 different things but if we look closely you will find it in single place. One have 8 lines in one picture and there is no line in other picture. I won :D
We used to play such games when were kids but it's the simplest one. In the first image there is a spider and in second i couldn't guess whether it's a dot or something else.