After striking out the glaze re-brush, cross grain first then in the direction of the grain to "feather out" the highlighting. You want the color transition to be smooth and subtle. Avoid the "sargent strips" look of sharp contrast when highlighting as it look very artificial. Another little tip. Use a clean rag and wipe your glazing brush often to avoid "loading" it with glazing compound. A loaded brush is great for dabbing glaze on a light spot, but will make it hard to get out the brush marks and will leave splotches when feather out the highlights.