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^^ That is orignally a David Harkey production I believe, except DH didn't use a rose, just regular flash paper. Looks cool but I don't get WHY lighting some tissue on fire in a flash would produce a deck of cards? Haha.
Yeah you should look at repositioning your camera, get a bigger space into the shot, more space makes these particular moves a lot more decpetive, and look a lot more magical. Other than that, good job. I love this sequence.
I published a tutorial on a colour change very similar to this on a sadly long-gone magic theory site a couple years ago. I couldn't find a reference on it, but ultimately decided to leave it as it seemed almost too simple to have not been done before, and as mentioned above, isn't really a...
Try detecting the orientation of the coin before the false turnover by feel rather than by peeking the coin. Much quicker after practice and your eyes don't have to strain to discern which way the coin is facing.
Dan and Daves method is good. I think it's also in the Organic booklet. I used to gimmick my own coins for controlled coin tosses. Was pretty simple/basic but did the job and was pretty inconspicuous. I may actually write that up some time soon.