Box cake isn’t a sin but can always take more stuff. A dash of real vanilla or some lemon zest will change it for the better. Ditto on the skewer test, it should pull clean and be warm on the lip. Springform tins are God but if using something complicated like a Bundt butter thevever living fuck out of it! Never try to ice something that isn’t cold.
Fondant is revolting, fuck that shit make sugar paste!