For a simple, photography-focused setup, SmugMug is the strongest fit from the options mentioned. It’s designed for photographers, is easy to set up, and supports selling images, including handling backend tasks like print fulfillment and shipping. It also offers features aimed at client work, which makes it a good match if you want private galleries or a more professional presentation.

Flickr can work for displaying photos, but it’s generally more of a sharing platform than a polished client-facing portfolio site.

Pixelpost is another option if you want more control and don’t mind managing your own web hosting, but it’s not as turnkey as a fully hosted service.

If your priority is fast setup with room to grow into sales and client delivery, SmugMug is the most suitable choice here.