In addition to the obvious drawing techniques needed for successful manga images, you can also take a little tip from the world of colour.
Study your colour wheel. The complementary colour to blue is yellow/orange, so if you place these together then it will really pop out. You should also keep in mind cultural colours: red, for example, is a more traditional Chinese colour than orange, so that is how we chose the hunter’s robe colours in this particular image. All these little planned out details do add up in the long run.