Your lineart is, as usual, amazing, and the colours are great!
But, if you don't mind me saying so: I think you are not using the Copic markers to their fullest here, they can blend much more than this. Sorry if this is like you intended it! I just think the colouring looks a bit sketchy here, technique wise, and I know how good you really are
Or maybe that was what the "practice" bit was about