Hello! I run a very small home bakery which mostly started out because I couldn't keep baking ALL THE THINGS for all of my friends anymore without charging for it! That said, I am still sort of figuring things out as I go and I got a quote request for a cake that looks like this, it has me a little flummoxed. The caption on this reads that this is all buttercream...do you know the best way to achieve this look? I know how to do a tall cake, but I'm just not sure how she did the sides.
Chill the first coat, then spread the bottom layer on in an uneven line as high as you want it. Then smoothe it out with a scraper. Make sure it's thick enough to keep the separation. Chill that, then make your paint and brush it on.
It's ok if it's uneven and maybe has a smudge here and there, that's the look of the cake.
Ditto what rychevamp said!
There's a lot of tutorial on youtube. The technique is called "fault line cake".