I love the project, sounds like lots of fun. Ratatoi is one of my favourite movies, so I have a very clear idea about what you'd like to see. Would you be interested in real, done from scratch painting on a highest quality paper? Say, 30 X 40 cm? You'd be able to frame the original (please note, though, that postal expenses are not included in the quote). I suggest rich watercolour/goauche painting, but mixed media of pen and ink drawing and watercolours or coloured pencil is also an option.
Kindly check my portfolio here for an idea about my skills and my previous work, and if you are interested, contact me to discuss this further.
I'd be very happy to hear from you,
best,
Dusica