Draw a long, curved line for the main vine
Add smaller branching lines coming off the main stem
Vary the thickness of the vine slightly
Sketch leaf shapes along the branches
Add tendrils by drawing thin curling lines
Overlap some vines to create depth
Use irregular curves to make the vine look natural
Add small nodes or bumps where leaves and branches grow
Outline the shapes more clearly
Erase extra sketch lines
Shade one side of the vine for dimension
Darken areas where vines overlap
Add veins to the leaves if desired