Sort:  

Takes a fair amount of time. Could have kept going as well. So many finer details could be added but I sometimes wonder if it's worth putting it in or if it just gets overlooked.

always see different things the more you look, guess the brain doesn't take it all in at frst glance

Just like staring at the clouds. Same effect. Hard to explain. Even that black and white image I placed in a comment; look closely and you might start seeing the cave painting I stashed away in there.