Well, if you ask me, which you're not, $15 is waaaaaay too cheap. You're under selling yourself. Really. With the time it takes to sculpt, paint, and add in materials costs what are you making... $4 an hour?
I'm making a life size leonberger bust and sculpt mainly monsters/halloween masks so I know where you're coming from. Most people don't understand or appreciate the amount of work that goes into something hand-made and unique. Not pumped out by the thousands from a mold in China.
The dane you made has loads of character. Looks awesome. Good luck. I hope you sell lots! I'm sure I don't have to tell you dane lovers that you're getting a great deal!