I installed the interior window trim and window panes in the front windows today. I also added siding to the lower half of the front of the dollhouse. It can be a bit challenging to do this with the porch roof in place, but it's important to avoid installing siding under it. You just have to work around the porch roof gable carefully. Try to align the siding angles as closely as possible to the roof, but keep in mind that you'll need to use spackle later to clean up the joints.
I haven't installed the exterior front window trim yet, as it needs to go on after the siding. These laser-cut dollhouses have very precise and thin trim, so it's essential to position your siding as close to the edge of the window opening as possible.