I just thought of a couple of more tips, the first one is for the new guys; most brushes come with an adhesive type of stuff in the bristles of the brush, if you bend or otherwise manipulate the bristles you will actually be breaking some of them and doing damage that will crop up later, what you need to do with a new brush is to swish it around in warm water with a drop of dish soap until the adhesive is dissolved, then you can paint with it. Second for the new guys, don't dip the brush all the way into the paint, that will get paint into the dense part by the metal ferrule, that is very hard/almost impossible to get out, some people will not even dip the brush into the bottle, but will put the paint onto a palette surface so that they can better control the consistency of the paint and how much they are picking up. If you have to dip then just dip the tip only and then wipe off any excess. Do not use a good brush to push paint into hard to reach places, that will just make them into porcupine brushes with spikes pointing everywhere. If you can afford it, have one brush for metallic and one for all the other colors, the metallic pigment that gets into the brush will sometomes come back out when you don't want it to, like when you are putting the finishing touches on a characters face. If you cant afford it, just be careful and at least use different container of water for rinsing cleaning and thinning of the metallic paints.
For the experienced painters, some one PM'd me about the acrylic brush cleaner and how to use, I put about an inch into a small juice can, then I use a plastic can lid in which I have made several slits. X style with my xacto. I then push the handle of the brush through the slit X and then put the brush into the juice can with the lid resting on top, this keeps the brush from resting on its bristles and acquiring a permanent curve or wave, I usually let them sit for an hour, or till the end of my painting session and then take them out and clean them with warm soapy water, repoint them and store them up right. I do reuse the cleaner, it is good for quite a number of times. I hope that answers your question. steveb