Here’s what I do…have your three colors on hand and use them all at one time to get a smooth blend. Start with your lightest color, ivory…which I assume is the wingtip. Paint the tip ivory all the way to the point you want your blend to begin, and just a little bit over that, then dip your still-ivory-laden brush into your next color, tan, and with just a little bit of the new color on your brush go ahead and brush onto the area you want the new color to gradient. To get the gradient smooth you will need to add more ivory paint over the tan, and visa vera until it’s smooth and just the way you want it. By then your brush will probably be mostly all tan paint. Keep your paints wet and work this kinda fast, then continue the tan color up to the point you want your last color to begin, the brown…and do the same thing over again. If you ever wet your brush, make sure it is asy dry as you can make it before proceding with blending because sometimes water pushes the paint around rather than helps you smooth things out. Let me know how it goes!