Product mockup (envelope + drawings)

Design details: I am selling 10 paintings on plain, A4 paper. These paintings are sent to the client in an envelope.

I am looking for a mockup of this product for my webshop so that visitors on my webshop can instantly see what I am selling.

Mockup should include:
- An envelope
- 10 A4 papers with a drawing on it. (I will supply the drawings in a later stage. I guess only 2 or 3 of them should be visible)

When a viewer sees this image, it should be clear to him/her that he/she is getting an envelope with 10 A4 drawings.

Inspiration:
- http://pixhst.com/pictures/3131448
- http://0.s3.envato.com/files/65410855/preview.jpg
- http://www.qualityeducationandjobs.com/wp-content/uploads/2014/12/makeup-subscription-boxes.jpg (but then with envelope)
- http://ww1.prweb.com/prfiles/2013/09/26/11168913/Jewelry%20Subscription%20Bezel%20Box.png (but then with envelope)
Target audience: Potential buyers (it should be clear to the buyer that he/she is getting an envelope with 10 A4 paper drawings)
Ideas for the visual style: See details
Urls to draw inspiration from: - http://ww1.prweb.com/prfiles/2013/09/26/11168913/Jewelry%20Subscription%20Bezel%20Box.png http://pixhst.com/pictures/3131448 http://0.s3.envato.com/files/65410855/preview.jpg http://www.qualityeducationandjobs.com/wp-content/uploads/2014/12/makeup-subscription-boxes.jpg
Extra notes: