ideas for postcards (to promote the launch of the book)

i want to take crops from the book illustrations of certain parts of the illustration, this way it will not give away the illustrations you will see in the book but will promote and showcase the type of work people can expect to see in the book. in the postcards i just want to focus on just the figure, taking away the context of the scenery 'iam showing in the book. i will team the illustrations with the quotes that i am using in the book also.