Deep Photoshop Retouching and Image Mixing

Design details: Hello,
I need a REAL EXPERT in Photoshop capable of mixing images and make them look NATURAL and REAL:

Attached is an image with a mosaic of white balls and a girl and a bag.

I need you to substitute the balls mosaic with White Mice mosaic.
I need you to substitute the girl with another Girl.
I want you to place the bags on the mosaic. One of them will be holded by the girl.

- Attached is the image with the white balls. The real Bags Images will be sent via wetransfer.com
- The girl is up to you, feel free to chose a beautiful Fashion Model that you can manipulate and put among the mice.
- And these are all the Mice photos I have been able to find:
http://www.istockphoto.com/photo/dead-mices-15744313?st=c7554ff
http://www.istockphoto.com/photo/albino-mouse-family-29239646?st=c7554ff
http://www.istockphoto.com/photo/albino-mouse-eating-and-playing-36592982?st=c7554ff
http://www.shutterstock.com/es/pic-18012451/stock-photo-white-rats-in-the-lab-ready-to-experiments.html?src=yDml-rUT6Iv1tjojpQ9Evg-3-9&ws=1
http://www.shutterstock.com/pic-118290160/stock-photo-laboratory-mice-mus-musculus.html?src=3DCh0sgJuHL5kEdrtene4Q-2-11&ws=1
http://www.istockphoto.com/photo/little-mouse-41056014?st=c7554ff
http://www.istockphoto.com/photo/little-mouse-41058070?st=c7554ff

Let me know if you have the resources and expertise to mix Bag and Pictures naturally.

Kind regards
David.
Ideas for the visual style: Naturality, Realistic, well integrated
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