Hi -
That was very good! I have a couple of comments but they are very very minor - on the whole that was an excellent color change.
1) Generally, if you are doing the change face-up, you can make it much more visual by changing a red face card into a black spot card or vice versa - QH to AC is much better than 9C to 9H. Still, you can't always set up beforehand so just a tip to remember

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2) I find that it is possible to spread your fingers during the change, which makes it look a bit cleaner. It's not a big thing, so don't worry, though!
Kati