Sometimes unwrapping depends on how you plan to use your model (flat shading, hand painted, normal mapped, etc.) but your paintover looks similar to how I would try to arrange my UV islands. That blue piece seems like it would have to have a couple of seams where those 90 degree inner corners are (the ones which can't be seen in the paintover shot).
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Or ask someone here to fix it for you, and remodel everything to learn from it (including UV)