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To be honest, these looks effortless. You need to put more work to be critiqued. At the moment, I can't say much other than pointing out what you obviously lack. You need to put more concept or action into your sigs. They just look very style monotone.
You need to work on text and colors. Your last sig hurts the eyes before the colors are so dark, LQ and vibrant. You show a good understanding of placement.