Notes really should have faces on them. It's easier for the human brain to detect when something isn't quite right with them and also to be able to see differences between one note and the other. This helps to detect forgeries.
Outside of the US the green dollar bill is one of the most known incarnations of her, changing it would be sad, to say the least. It'd be like painting the Statue of Liberty pink.
The GBP notes are an interesting set of designs, but I wish I could see versions that used the current colour scheme (the linked designs mistakenly(?) use green/blue tones for £10 and orange/brown tones for £5, which is the opposite way round to all existing notes. £20 and £50 more accurately match the current notes).
I'm not familiar enough with the GBP notes to have noticed that, thanks for the info. I'd like to see the correct colors used as well, it must be very confusing if you've grown accustomed to the standard colors.
And the new Swiss Francs, which I find the most beautifully designed notes I have ever seen. Some of the following notes are not out yet, Switzerland has been replacing the old notes slowly for the last couple of years.
I wasn't able to find an image of all the notes, here is the new 50 franc note:
I learnt this from the Bank of England museum.