Edit 55 items for online shop

I am nail designer in Ireland and have online shop but my images are all over the place. They are all different shape and size. I need someone to come up with a concept of pretty images that look all the same and even.
I have 55 items at the moment. I am concerned only about images on front page. So it would be 55 items to photoshop. If you are interested, check out nailsindeed.com and let me know how much it would cost.
Regards,
Stella