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Lilikins I keep varying the signature between just initials and full one.
Any letters and words attract attention. So choice of color, size, positioning does matter.
I usually prefer to use one of the colors similar to color scheme of the painting not bright red.
I suggest to scroll through online museums and research how masters signed it. If you dry painting first (oil painting) then you can sign and if you like you keep it, if not erase with linseed oil and try in new color, form and place.