Chanel 1934 fashion sketch - original drawn picture.

I have a very old picture that has been stored for years. When I began to really look at it, the colored picture drawn, looks like a sketch for a fashion magazine in the 1930's. The woman beautifully dressed in what looks like a blue chiffon cocktail dress. Her large Greyhound dog is also with the same color blue collar.

At the bottom right hand corner, is a circle with a c in it. Also 1934 18 . Then below A HAND SIGNED SIGNATURE THAT SAYS Chanel.

I have compared the signature to Coco Chanel and it does match. It is in very good condition, but the back is yellowed some with time. It is 72 years old.

Please give me some information on this.