Lighting should be flat in this kind of situation , do u really need HDR for such scene ? I dont know coz from my experience i think HDR come in helpful when u are facing a challanging situation whereby the exposure for the sky and the foreground is very different and u can only choose to expose either the sky of the foreground right ...
Anyway nice pic but i think u can touch up more on the stone area . What software are u using ? PSCS2 ?