Im not sure if you have already got it, but ill show how you can do it.
make an auto start event and make it "set character graphics to (whatever you want it to be)"
then when you go onto that map, it will go to that graphics.
Then whenever you make a teleporting event, make it so you change character graphics to it's nomal graphics.
Hope this helps! If you already know, sorry
p.s. THis is for rpg maker 2003