i would do redwing.... as there not many custom of that around...so you can pretty much paint any scheme you like for him... and i love red...
If this is your first time then i advice you do anther piece to get you use to repaints of transformers , try a deluxe toy or a voyager cause MP3 is quiet an expensive experiment ... He is also a masterpiece and has alot of small parts that are pinned together and he got LOTS of rubbing points where you have to sand down heaps or you get your paints scrapped off ... Also MP3 plastic is a little brittle so you have to be careful for the stress you put on his wings and joints . He is also a fairly large figure so i recommend you using a airbrush because hand painting the wings section alone would be a nightmare without leaving any streak /brush marks , and you have to do quiet a few coat as well cause he very dark in colour..
Just post a work in progress of your customs and we all can give you advice on it as there a few customizer on this board.