There are a couple of things to do to be sure that you are maximizing the size of your logo in your galleries, emails, contracts, and invoices.
First, make sure that the file you’ve uploaded to your Color Set is at least 300px on the longest edge. (For best results, we recommend that your file is a PNG with a transparent background.)
Also, be sure that your logo is cropped all the way to the very edge of the graphic. If you have any additional white space in the file, it may cause your logo to appear smaller than it actually is.