When you click the 'Buy Now' button your choice will be added to your cart. So select any items that interest you then continue shopping. Your cart can be amended before the final check out.
Take note, you don't need a Paypal account to use it. When you click the 'Checkout' button, towards the bottom of the page is an option to pay by debit or credit card as a Paypal Guest.
International customers will often have to pay import duty before their picture can be released by customs. This can be quite substantial, for instance Canada may charge up to 20% of the total buying price including shipping, depending on the province. It is in the customers own interest and responsibility to check in advance what this cost may be as it is not included in my selling price. A guide to rates charged by most countries of the world can be found here.