To determine which step the artist clearly used when drawing the image, I would need to see the image in question. However, I can provide guidance based on the options you've listed:
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Two vanishing points: This technique suggests the use of linear perspective, where lines converge at two points on the horizon, giving depth to the image.
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Only orthogonal lines: These are lines that lead to the vanishing point(s). If the image predominantly features these lines, this could be a clear sign of perspective work.
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Imagery in the background larger than in the foreground: This is typically not how perspective works. Objects further away are usually depicted as smaller.
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Imagery in the foreground lighter than in the background: This could suggest atmospheric perspective, where colors become lighter or bluer with distance.
If the image features strong depth and perspective, it likely employs "two vanishing points." If it's mostly lines, it might rely on "only orthogonal lines." Without visual context, I can't definitively state which step was used. Based on what you observe in the image, choose accordingly!