Is oil shinier than water? Why?
The Fresnel equations, http://en.wikipedia.org/wiki/Fresnel_equations, are used to calculate reflectivity of transparent substances based on the index of refraction of the liquid vs. that of air or other medium. There are complications introduced by conductivity, and solids may display anisotropic reflectivity, see http://www.hindawi.com/journals/isrn/2012/732973/.

Dispersion staining is a technique for staining microscopic specimens depending on the change in the index of refraction with the color of light (dispersion), see http://en.wikipedia.org/wiki/Dispersion_staining. This uses the shininess of substances in a liquid, often an organic immersion oil, to help distinguish or identify them.

Note that metallic reflection is based on a "sea" of electrons bouncing back an inverted wave, and differs from refraction. Liquid metals such as mercury are shiny for that reason, but I do not know if there are sufficiently conductive organic liquids that would have metallic reflection.