Try scrolling down the front page, How to Make an Image Icing Plaque may help... Im terrible at pricing, but I guess it would mostly depend for me how much is plastic figures and how much is handmade. Like the rainbow.... making that with even colors would be my challenge, hope you can buy one
wow! What a cute cake! I would think you could make the care bear out of fondant/gumpaste or RKT. It looks like she is just sitting on the top layer of the back cake. I'm not good at pricing, but I would say an absolute minimum of $2.50 per slice, plus a fee for the care bear and the rainbow. The customer would also have to supply or pay for the other figurines (I am assuming they are plastic).
For the Carebear, I suggest you use RKT. IT looks like the fur has been piped.
Hi I'd use gumpaste - google aine2's work on you tube she is the master of this kinda stuff she has a tutorial on making bears but i don't think that's on you tube but her other videos will help you with assembling this wee bear. Just a thought (i'm not trying to be a PITA) aren't there major issues with copyright when making known figures and selling them eg. Disney etc and wouldn't this apply with carebears? I'm a hobby baker so i have no idea what you should charge but most pros on here have set fees per serving and for figures.