I pretty much 90% render in MR for a character, so I apply a Mr sub d approxiamtion to it, and smooth the mesh.
I pretty much follow a video thats now on you tube, heres the link to it http://www.youtube.com/watch?v=dOrmlnIZrAM
You've picked a big model to go for for doing an organic, as it's not human (in some ways, its not but it is), but I bet your picking a lot of stuff up on your way!
I'm currently getting some stuff together for a character that I want to do as a protfolio piece that not "human" so i'm trying to ground it off the bat, its a bloody hard task to get it all sorted, anatomy wise, mixing many parts, before doing the bits you want (modeling, textring and rendering!), but its well worth it in the end.
I hope in the previous posts I didnt sound harsh, I'm not, just giving crit other than "cool" as adding the extra bits will make the difference, as it's a more thought out model, rarther than a "alien" head with a muscular human torso
"No pressure, no diamonds" Thomas Carlyle