Ah, thank you! (Seriously your Sushi poodles are so adorable!)
You know I had trouble with that at first, but you can shrink the image size on the mug using the drop down slider so you can readjust it.
Oh! Yeah you can turn any image of any size into patterns automatically by pressing these buttons here:
And you can readjust the size using the slider so you can decide how big or small the pattern becomes.