Hatching

A pattern of lines or shapes that is used to distinguish certain areas of a drawing from other areas

Home tab > Draw panel > Hatch

Boundary: Pick Point
Pattern: ANSI37
Angle: 45
Scale: 100
Options: Associative

pick a point inside to hatch

Select the door, change the angle to Closed

The hatch pattern fill up the space

Repeat the hatch command:
Pattern: Solid
Color: Blue

Options panel - Outer Island Detection

Fill the color for the basin

Change the color to 9

Fill the color for the toilet set and bathtub

Change the color to Green
Options panel - Send Behind Boundary

Pick a point inside the restroom

Draw panel > Gradient

Pattern: GR_SPHER
Color 1: Blue
Color 2: White

Pick a point of the inner circle of basin

Change the color 1 to 9
Pick a point inside the toilet set

Pattern: GR_CYLIN

Pick a point inside the bathtub