Once you've added an image to your Marketing template you might need to tweak the size to fit in better.
Tip: The width size is best 600 or less
When in the notification make sure to click the image and then the button to bring up the image's properties:
URL - this is where it will look for you image. If you press 'Browser Server' it will go to your images in 'Image Browser'
Width & Height
Width = Enter desired image width. Should be 600 or less
Length = Enter desired image Length
Padlock Symbol = Locks the proportions when you change either the Width or Length - ideal for not having skewed or stretched images
Refresh Symbol = Pressing this will put the image back to it's original size
Border = If you want a black outline around the image you can enter the size here
HSpace = Horizontal Space = Add a space before and after the image - great for centering your image
VSpace = Vertical Space = Add a space above and below the image - great for centering your image
Press 'OK' to save.