If the windows to your soul are dark brown, then there are certain eyeshadow colors that will complement your peepers best. But you have to find out what other colors are hiding in your eyes first.
The winter-spring transition can be a freeing moment. It's not, of course, a "moment." Typically, you have at least a few weeks of fashion limbo, when it's too warm for a coat, too cool for a sundress and perfect for a long walk outside. So what to wear?