hmm... its hard to fix this if youre not planning to cover it all with designs like cut outs, etc.
judging your pic, i can see that the "cake" is not evenly covered by your buttercream... there's no turning back if your fondant is already on your cake. the only resort i can see is to cover it with cut outs.
What is it going to be? Can you put another thin layer of stiffer fondant over it? Your fondant looks kind of soft, is it MMF?, that is not notoriously soft-you may need to add some powdered sugar & cornstarch to it, then roll out another coat. I did this one time when I made a cake that was like this, it was supposed to be like a bunch of marbles, and 2 of them did that, I had to use Wilton fondant for the second layer, and it worked just fine...Good luck dear!.
I would remove the fondant, you might need to do some carving to make the seam fit together better. Then place a slightly thicker coat of bc. Put it into the frig for a bit to firm up the bc, then recover with thicker fondant.
Go luck, I hate covering spheres.
I've done this. Turned out that there was a small and I mean small ridge on the top of one of the cakes. To do it right, you really need to remove the fondant, shave the ridge with a sharp knife. Smooth your crumb coat and then re-fondant. I know it's hard to think about doing all that but I'd rather spend the extra time and materials than try to patch it and I don't think you'll be happy unless you do it right. Hang in there.... deep breath and then back at it.
Did u let yuor buttercream crust over slightly and then put another layer over ther ridge? I find that that works better when trying to smooth/cover up join lines. If u havae time to take off the fondant and begin again, that's probably what I would do. Then try to get your BC as smooth as possible (kind of hard to be perfect ont his shape) then try covering with a slightly thicker layer of fondant. If you don't have time for a redo, I'd just try to smooth the buttercream through the current layer of fondat- with hands, fondant smoother, etc. and then apply a second slightly thicker layer of fondant. HTH.
Just my suggestion but I think I would take the fondant off and make a whole lot of MMF, place the MMF in a zip lock bag and let it rest over night. It isn't soft after resting. If it is still sticky knead it on a surface sprinkled with corn starch. Now as far as the seams go I think I would put them two halves standing next to each other instead of on top of each other because the sides will be the most noticeable right? Chances are you will have decorations on the top, front and back of some sort should the seams pop their ugly heads but I don't think they will if you put a nice coat of BC on before you put a nice thick wrapper of fondant. I put on more than a crumb coat when I use fondant to give me a nice cushion to smooth out those rough places. I would also roll out the fondant pretty thick to avoid stretching. Use lots of cornstarch on your surface. Good luck!
what an adorable cake!! I love it!
as a side note, Diane I've seen Duff fillin the cracks of his fondant cakes with royal icing.
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