I didn't add any greys to this piece since the requester asked for colors on it anyways and due to the picture having alot of details compared to most other sketches I decided to save myself some time.
Edit: Thankfully I had alot of this already done and/or planned out so I was also able to finish this in the meantime, only went with celshading because it's quicker than some of the other shading types I do. And yes, the frosting is finally not a weird black mass anymore!
Thank you so much for your support and this adorable request ♥