Default is 19
U can judge the animations by taking the number of the MON.wil ie MON_20. (20 *No Wil* - 1) X 10 then u add on 0 for images 0-1000, 1 for 1001-2000 etc
There are some weird and wonderful things that go on with mixing race image and race. I've investigated it a bit, and it's not quite as simple as adding an attack type, because u might be able to say add a lightining graphic attack, but that doesn't mean the new appearance melee will match the default mob.