Sketch to 3D Interior Wonderland

A hand-drawn sketch transformed into a hand-drawn style 3D interior film 
0:00-0:02, drawing is complete, and hands and pen move out of the lens. 
The subsequent shots seem to "slip" into the painting, beginning within the world within the painting. In the painting world, the interior is expressed in a hand-drawn style, accompanied by a slight indoor wandering perspective and a panoramic shot. The artistic style of the painting world must be highly consistent with the previous one