Hey, a fellow Sculpey fan!
That looks good for your first miniature! All I can say is "BAKE IT!"
In my first adventure, I made all the miniatures out of Sculpey. But I did not bake them. And when I placed them out on the battlemat, one player would always pick them up and examine them exquisitely, completely mashing the fine detail...
275 F, 15 minutes for every 1/4 inch thickness.