If it were me doing it, I'd charge a nominal fee for the leaves and pumpkins, just to cover my cost. They don't look very difficult or time consuming, so for a smaller cake I'd probably only charge another $15 or so for them.
As for base price, check around your area for buttercream iced cakes and place yourself somewhere in the middle of the range.
In my area, I charge $2.50 per serving for buttercream, which includes basic decorations like I see here. That would total $250 ~ $300 for this cake.
If the client wanted the square on the bottom, you could do 12" square, and then 10-8-6" rounds. This comes out to 113 servings. If saving the top tier for the anniversary, then you could do 12" square, 10-9-8-6", which gives you 120 servings without the top tier.
My feeling is that you are making leaves instead of flowers. Do you charge extra for flowers? Why should you charge extra - it's the design?
For only 100-120 you are only going to have 3 tiers - probably the top 3 show in the pic. I think I would make 14, 10, 6 for about 116 servings. If you go any bigger or add a sq base it will be way over OR add a 4" top on top of the 6 for about 12-14 more servings. OR, or, make the base 14" a square....can't remember right off how many more servings than a round but about 15-20?
I just made a round wedding cake w/some of the same elements. Fondant leaves, acorns, pumpkins and cranberries. It was pumpkin spice and chocolate pumpkin cakes w/cream cheese icing covered in fondant. I made it for my husbands nephew and his bride. They loved it! It was 12, 9 and 6" I've posted pictures below. HTH
Thanks everyone for your advice. I've never priced a cake for someone who wasn't family so I apreciate all your help.
KASEYNH your cake is beautiful!
I'll post a pic when I'm done. Thanks!!!
I agree with starkie. $2.50 for buttercream per serving sounds good.
You did a really great job on it! I'm sure it was a big hit.
I love it! I think you did a beautiful job! Congrats to you.
Your cake is beautiful. I really like what you did.
Looks great to me!!
It looks awesome! Great job! How much did you end up charging?
Thank you everyone you guys always make me feel much better.
CYLSTRIAL I ended up charging $2.50 per serving.
I think it is beautiful. I hope that I can make one that is half that good one day......many, many years from now when I have had lots of practice and really know what I am doing...lol
Kels_bels your cake is beautiful. Great job on the leaves and scroll work!
Edited to correct spelling
That is one of my favorite cakes and you definetely did it justice. Great job!!!