I have a bride that has asked me to make a similar cake to this one?

As of right now she wants it to be 6, 8, and 10 inch.  However, there may be a need to add one more tier at bottom (12 inch).  What would you suggest for pricing.  I rarely make cakes to sell them and I want to cover costs of ingredients and my time.  Thanks in advance for your help.  BTW the cake would be covered in fondant and filled with a mousse filling of her choosing. 

AAdd up your estimated costs for ingredients, labor (how many hours you think you will spend on the cake * your hourly wage), and per-order overhead (insurance, license fees, etc.), then add a markup for profit consistent with market values in your area.

You are probably looking at a price in the $250-600 range for a 6/8/10, plus an additional ~$150-450 if you add a 12" tier.