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> The last line of the picture contains some 'noise'

Note that if the picture is prime, then the last line must always contain noise... the last digit must be a 1!

I also feel like it's slightly cheating that the first line doesn't contain noise, or a leading 1 digit... the number doesn't naturally fit into 64x64 bits because of all the leading zeroes.

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If you "draw" with zeros instead of ones, then you don't have the last-digit-in-foreground problem.

It also solves the leading zeros problem. That's potentially a lot of extra computation to handle, though, since the resulting number in the giraffe case would be something like 2^500 times larger. I guess the question of whether that is worth it depends on your individual value for image shaped primes.

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