This model of a guitar, is a ramirez which is one of the best and most well known producers of classical guitars. There is two reflection light. One from above and one from the side.
You can se some renders on my page http://lucabuono.com. The guitar consists of 147129 faces. Rendered in Cycles. Some of the textures are not included because Creative Commons licenses.__[
I hope someone finds this model usefull.