Video Tutorial:
Use the Standard Material as a way to apply your own textures. Lumion can generate a Normalmap derived from the Colormap.
Made in version: Lumion 7.0 Pro.
See also:
Knowledge Base: How does the Standard material work in Lumion?
Knowledge Base: What is the advantage of using DDS textures?
Knowledge Base: How do 'Normal Maps' work in Lumion?