Okie dokie - placement of the flags first - it depends on the image itself - usually I try to align them centrally to the left or right of the inner ring - obviously placement of flags isnt a rule but I just find that its more pleasing to the eye if you find a space that has little going on in the background as well - I could go into great detail about what looks pleasing but its subjective - the larger flags should be in the centre , either towards the bottom or centrally to the left or right - the smaller logos can be distributed along the same level as the flag on the bottom ( again personal preference) There are no hard fast rules but keeping central alignment for flags to each other also looks pleasing to the eye - have a look at ACTUAL cd art scans to see how studios do it - you can have lots of flags if you wish - (I keep mine minimal cos thats the kinda guy I am LOL) - I also check this site to find studio and audio flags are correct
http://www.blu-ray.com/
When you see an original cdart you will see multiple flags for distributors, companies, studios, regions, general warnings and copyrights, the list could go on, but as I only do custom jobs I want it to be about the artwork so for me studio/distributor and audio flag and dvd/bluray flag suffices
The copyright curve does add a more realistic touch for sure - if you can do it it would be a nice addition - I agree that cdart should be more than a background image with a logo on it - which is great to hear that you are actually thinking about more than just the image but also the aesthetics (+1) - I am constantly reworking images for discs to see what works and what doesnt - look at my discs - you see some fine discs with no votes - reason - layout usually - not because its a duff film - it has the downloads but no votes to me thats shouts 'meh' - quality is there layout was all wrong
To sum up (I can drone on can't I) - there is nothing wrong with the disc here BUT if you move universal flag central vertically and central from disc edge and edge of centre hole - move dvd flag centrally where it is and distribute other flags around the studio flag keeping central alignment - with added copyright text around edge it should be golden
Have a look here for some inspiration
http://www.customaniacs.org/forum/
