Block all pngs (everything except default forum smileys):

||emps-world.net/forum/Smileys/default/*.png

Make exceptions for old pngs (if blocked all, use any that you wish to unblock):

@@||emps-world.net/forum/Smileys/default/cake.png
@@||emps-world.net/forum/Smileys/default/kappa.png
@@||emps-world.net/forum/Smileys/default/doge.png
@@||emps-world.net/forum/Smileys/default/frankerz.png
@@||emps-world.net/forum/Smileys/default/batman.png
@@||emps-world.net/forum/Smileys/default/potato.png
@@||emps-world.net/forum/Smileys/default/gnome_child.png

Alternatively use any or all of these to block the new ones:

||emps-world.net/forum/Smileys/default/4head.png
||emps-world.net/forum/Smileys/default/anele.png
||emps-world.net/forum/Smileys/default/babyrage.png
||emps-world.net/forum/Smileys/default/baited.png
||emps-world.net/forum/Smileys/default/biblethump.png
||emps-world.net/forum/Smileys/default/bless.png
||emps-world.net/forum/Smileys/default/brokeback.png
||emps-world.net/forum/Smileys/default/cmonbruh.png
||emps-world.net/forum/Smileys/default/coolstorybob.png
||emps-world.net/forum/Smileys/default/dansgame.png
||emps-world.net/forum/Smileys/default/elegiggle.png
||emps-world.net/forum/Smileys/default/failfish.png
||emps-world.net/forum/Smileys/default/hotpokket.png
||emps-world.net/forum/Smileys/default/kappapride.png
||emps-world.net/forum/Smileys/default/kappaross.png
||emps-world.net/forum/Smileys/default/kreygasm.png
||emps-world.net/forum/Smileys/default/LUL.png
||emps-world.net/forum/Smileys/default/notlikethis.png
||emps-world.net/forum/Smileys/default/pogchamp.png
||emps-world.net/forum/Smileys/default/residentsleeper.png
||emps-world.net/forum/Smileys/default/salt.png
||emps-world.net/forum/Smileys/default/seemsgood.png
||emps-world.net/forum/Smileys/default/smorc.png
||emps-world.net/forum/Smileys/default/trihard.png
||emps-world.net/forum/Smileys/default/wutface.png