Well, that depends -- if he's importing an image, then he may want to make the world dimensions bigger, by changing the min/max-pxcor and min/max-pycor variables. That would help with the resolution of the imported image.
Making the patch size bigger helps make the whole canvas larger, but it could still have a blocky-looking image get imported if there aren't enough patches...
However, I'm not sure quite what Estephanos wants to do, or how it relates to having multiple turtles getting sprouted at each patch...