Answer:
His computer's memory capacity
Explanation:
The factor that can limits the number of additional layers, layers effects and layer sets that Peter can add to an image in his design project is his computer's memory capacity.
The larger the memory capacity, the more Peter can use the layers effects in his design. Using additional layers effects in design depends on the memory capacity of the computer.
For Peter to use additional layers effects in his design effectively, he needs a computer with large memory capacity.
