Further touch ups to the surface can be done with the use of a small trim brush or one similar to those used for water troweling smooth coat plaster. The main thing to keep in mind with many textures is that the effect you are trying to create and imitate does not necessarily have to be done in one step. Look at the surface and study the different layers that are there. Then try to simulate each layer a step at a time. This can help you match the toughest of textures.