My first design - Pavlov's Pluto. Critique/help please…

Further to my lengthy intro here, I am very pleased to say I'm close to finalising my first design for submission. It is entitled Pavlov's Pluto and will be subbed for the Mickey & Friends challenge.
The design is inspired by a famous psychological experiment in classical conditioning, carried out by Ivan Pavlov (and his dogs). Read about it here if you wish.
I personally feel the design could benefit from a bit of texture to give it more of a vintage feel and a stronger connection to its inspiration (given the experiment was carried out in the 1800s).
Problem is, I'm brand new to designing and am not exactly sure how to apply a texture across all my layers in Illustrator. If someone is willing to give me some tips, I'd greatly appreciate it.
Thanks for your time. Hope you enjoy the design.
glanboota
I like it cool concept :) so neat
Aji ontowiryo
interesting concept, but i'm not sure many people will gets it though.i even don't know who the hell is pavlov.
illustration is okay i guess.
Queeg500
Thank you, glanboota!
Queeg500
Bump
Queeg500
Bump...
thomas callahan
Here's a texture tutorial
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