Ok so what all do you have as far as plugins, models etc..you would really need an IBL light set up such as UbErenvironment or !!!!AhEnvironment!!!! to get those nice HDRI images going. there is a good freebie called Stonemason inspired lighting over the Daz freepository forum wich is basically a generic Light dome Pro until you feel like springing fthe bucks or the real one(No IBL support in these though) Other than that, start posting some renders and ask for positive criticizm and render settings advice! People like to see where your at before they can advise on how to improve :)
Look forward to seeing a post or two, mabe tomarrow huh!!, Ill give you some pointers.