To achieve this, you would use the technique called painting with negative spaces. To do this, you will begin by outlining the area you would like to stand out, and gradually fade the paint away from it. In doing so, you will make the picture stand out by surrounding it with darker colors. You are effectively placing the light on dark, and using this technique will cause the lighter areas to pop. You may need to practice this technique a few times to master it, but it is a very useful option as one of the watercolor techniques for beginners, and one of the best watercolor painting tips as a whole.