There's a trick.
I literally mask off the edges of the panel. It's just like the car paint/body people mask off the windshield or weatherstrip.
I get a scrap piece of paper and make 4 dots where the rectangle goes. I cut it out, punch the corners, and tape it to the board on top the art.
When I have the basic structure or composition in mind then it's a whole lot easier to keep on drawing a little past the edges, to maintain a sense of correct proportion and space.
When I get a good enough 'fleshing-out' of the image then it's time to throw away the mask and fill in the detail...
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