Try shopping for brushes at stores that cater to “fine” arts supplies. Good paint brushes are not “mysterious” nor are they hard to find. Having said that, really good brushes are also not cheap. You will pay for quality. Still, if they’re well maintained and not abused, good brushes will also last for a number of years. Your investment is not so bad if that’s considered.
Using the right brush for the right job with the kind of paint it is intended to be used with is also important. Learning to work with your chosen type(s) of paint is critical. Different kinds of paints have their own working qualities and characteristics, and those may require different kinds of brushes even for the same job. The difference in the kind of paint can change the kind of brush that’s needed. There’s more to hand brushing paint than simply dipping the brush into the bottle and spreading it around on the surface.
Start your search for a brushe by first deciding on the type of paint that you will be using it with. Brushes for water based acrylic paints are different from brushes made to paint oils or enamels. Soft water color brushes may or may not be good for other water based paints depending on how you want to apply that particular paint.
Brushes made to work with thick tube paints (either water based acrylics or artists oils) are different than brushes made to handle thin paints. Natural bristle brushes, like squirrel or sable, have different properties than brushes made with nylon bristles, although you may find brushes with each type of bristle material made for the same kind of paint.
There’s also a reason why brushes come in so many different shapes and sizes. Spend a little time studying and learning the purposes or intended uses for these. You might have to use some imagination to translate the “intended” brush design into a relatable “model painting” use or purpose.
For instance, I use sable liner brushes for the vast majority of my water based acrylic painting. Liner brushes are designed and intended for sign painters and artists drawing thin lines. Their points are made to create a small “chisel” shape in one direction or a fine point when turned 90* from the “chisel.” Liner brushes also have very long bristles compared to other types of brushes. These long bristles will hold a larger volume of thin paint than the same number sized round brush.
I also use liner brushes for pin-washes made from diluted artist oil paints. However, liner brushes will not work really well for actually painting artist oil paints (which I use on my figures). The long bristles are too flexible to move and brush out the thick oil paints. Brushes with short bristles have a stronger, more “springy” brushing action, so I use regular sable round brushes for most of this kind of painting.
Ultra small brushes might seem to be the perfect thing for painting figures. However, if you’re painting with water based acrylics, most really small brushes don’t actually hold enough paint to be practical. On the other hand, they might be just right for applying a very small dot or line of paint.
Don’t abuse your “good” brushes by using them for rough jobs like dry brushing or harsh scrubbing to blend colors. Use old brushes that have started to lose their shape and bristles.
Finally, take care to clean your brushes properly and thoroughly. It takes more time and effort than just swishing your brush around in a jar of thinners to clean it. There are a number of proprietary brush cleaners and restorers available. I personally use a combination of Windsor & Newton brush cleaner (which is very harsh but will remove any paint - to include the paint on the handle, if you’re not careful!) followed by The Masters brush cleaner and restorer which I leave in the bristles after reforming the tip shape.
Clean your brushes as soon as you’re done using them. Don’t just drop them into a jar of thinners and leave them there for hours (or even worse, overnight or for days). Leaving them in thinners until you’re done for the session is usually OK, but no longer than that, please…
A good tip is to dip your brush in thinners (water for water based paints or mineral spirits for oils or enamels) BEFORE you start painting. This fills the bristles where they are bundled into the ferrule and helps to prevent paint build up in that area. Doing this makes the brushes easier to clean later.
Learning to hand brush is a skill that takes time and effort to master. There is no substitute for practice. The more you paint, the better you will become.