When replacing pictures, here are a few helpful notes on sizes that work well for areas of the template.
(1) Header Image – rectangular (tall) images work best to retain the placement of other items on the page. You are always welcome to use something square or landscape in this area (some adjustment of text might be needed afterwards)
(2) Services Images – these images can be any shape that suits your needs. You will find that it works best to have all images that are similar in shape and size to retain the consistency.
(3) Background Contact Image – almost any image (shape/size) will work here. A larger image (at least 1000px wide) will offer the best quality when it is stretched on bigger screens.