Gallery seeks online shop

We are an art gallery and are looking for online shop software for our art business.

We have the following requirements for the solution:

• Online sales of artworks (contemporary art), e.g., prints, small paintings, or small sculptures in the price range of a few hundred to several thousand euros
• Integration into the current homepage, built in as a menu item (button)
• It should also be possible to use it via smartphone
• Support for standard payment methods, e.g., PayPal, American Express, Mastercard, instant purchase
• Image-oriented - good visualization

One software workstation is planned. Work will be done using a MacBook and an open source CMS.