Quoted for truth.
I hope the way you talk about your spectators isn't an indication of your general attitude towards people, because that may be your main problem.
^^ 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 think i'd have to see that in the context of an effect (With a spectator picking the card) before I could give any feedback on that. That could be one of a lot of things that have already been done.
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.
Does it need to be in-the-hands? If you have a table, you could discreetly deposit the palmed cards back onto the top of the deck as you draw attention to the transformed cards.