Mental Ray and GI

Hi everybody! I gonna start very serius with 3d. I would like to do 4 or 5 jobs until summer.
A indoor scene, outdoor scene, a vehicle, and some special.

Before,around this days i want to do some exercicies about Ilumination, Materilas, etc... to get great results on the next jobs.

Here I try the GI (Global ilumination) with Mental ray.

I could do a Tutorial about it... Im not sure.

Time per render: about 15 minutes

Time of work: about 2-3 hours