I found out that not all the actors have the SV image by default. (I already re-validate my MV, I should have everything original) In the folder of \steamapps\common\RPG Maker MV\NewData\img\sv_actors, base on the naming convention, Actor3_1 to Actor3_4 should be there, but unfortunately not. Is it a simple mistake or there is a reason behind it? For me, I am just using MV to make my own story. I am not an artist to create all the resources by myself. All these official free resource are important to me.