The video below is how to add a Portfolio Item to a Portfolio Gallery when using the Canvas Theme.
Portfolio Items are a great way to show off a piece of artwork, but also for that piece to have it’s own page where you can put information about the item, a contact form, or even a payment button.
The video starts off with a quick tutorial in Photoshop on how to keep your image in proportion, yet make the image square to keep all your images uniform on your website. Keep in mind that you don’t necessarily have to keep the images square in all cases, but if you keep them relatively close in proportion and size, they will generally line up better in most themes.