If you go into photoshop and mess around with filters for 5 mins, you will soon see that if you over aggressively apply any filter to a photo it soon starts loo

If you go into photoshop and mess around with filters for 5 mins, you will soon see that if you over aggressively apply any filter to a photo it soon starts looking like a cartoon or painting due to the way that image processing groups blocks of colour together for manipulation.