To know which varnish to choose, it is important to understand the differences between each:
The non-varnished canvas has a stronger texture of the cotton which works very well for paintings.
The matte varnish has a much sleeker finish with a stronger depth in colors, making it more suitable for realistic photographed images (family, landscape, etc.).
The glossy finish is best used for images that are semi-digital (edited images) or digital images, with the glaze of the finish creating a reflection that almost emulates the lighting of a screen.
The silver finish is very special in nature and hence often a hit-and-miss. However, from our experience printing it. We noticed that images that have very strong contrast with prominently darker colors (for example, a picture of space) work very well
Please note: standards vary from clients to clients, hence we cannot guarantee that our opinion will adhere to your liking.