AAre you making the carriage and the figure and do you have the skill to do this cake properly? Licensed? Will you be using grocery store ingredients, buying in bulk or gourmet ingredients? All these factor into your final price. I cannot do a figure that nice, but I would charge at least $4.50 a serving. Also, that looks like a 6 and 10 to me, an 8 will not look the same.
ACheck out this article I wrote about pricing, it should help you: http://jasonkraftblog.wordpress.com/2013/05/14/the-magic-pricing-formula/
We would probably charge around $6/serving plus the labor required to create the topper.
I agree, this looks like a 6 and a 10. Also, the figurines would be quite intense.
AThanks for the advices. It's for a friend. I think I can try to make the carriage and figurine well.