Advice on opening a Gallery in my Shopify website

I have a Shopify website (www.positivelypostal.co.uk) and I would like to add/integrate a Gallery to it. The gallery is not for products to buy as I already have the shop for that. It is to highlight various pieces of art that either I have sent off in the post or that I have received and a collection of stamps/postcards. Ideally it should have all the features you would expect from a gallery, i.e. hovering over images to make them bigger, space to put in text and other details etc etc.

I have done a bit of research myself and I see there are various ways of doing this but I am unsure which would be the best, most secure and cost effective. I don't need anybody to actually install the gallery, I just need some recommendations and good advice as to which way to go.