One other note:

Looking at your stairs, they look like they are carved in a straight fashion. There is not really any indication as to up or down. You could cheat and place an arrow, or you can try this:

1) Create a new layer over the map
2) Apply a mask
3) Cut out the area for the stairs
4) Drop a gradient, white to black over the stair in the direction they are facing.
5) Set the layer opacity to multiply
6) Play with the opacity setting until it looks right.

Hope that helps.

Sandeman