In the photo above you can see how recessing the hinge into the back edge of the door gives it a low profile on the outside of the dollhouse. The doors can be left this way, with the hinges and front opening showing, or trim can be used to make a slightly more elaborate front facade for the dolls house or baby house.
Once you know that the hinges are correctly positioned, finish inserting all the screws into the hinge plates.
If you wish to add trim, glue it in place covering the opening front edges of the dolls house doors, and extending slightly over the front side edges of the dollshouse to cover the view of the hinges from the front.
When you have applied your chosen trim, use an eraser to remove all your reference markings and do a final finish sanding of the dolls house case and doors, using fine steel wool, not sandpaper. Do not sand too hard or you could go through the veneer.
Apply a base coat of finish to the wood. If you will be painting the wood, use a latex primer base coat and a good quality brush. When the primer coat/base coat is dry, use fine steel wool to rub out any brush marks and apply a second or final coat. Use a tack cloth to remove any dust before applying the second coat.