Hi gramps.
I used to struggle with the same problems with acrylic paint.
Until I discovereed painting mediums!
After years of struggling for smooth procelain finishes, I realised I like brustrokes now, so I like that they show, when need be.
Some people use a self-levelling medium (Golden makes one) that makes the paint level itself. I tried, and don't see the advantage of it really.
Since I now mostly work in glazes(transparent paint mixes(paint+medium+water)), brush strokes are hardly noticeable.
Especially because I wipe my colors with rags and papers, I can soften the strokes even more.
For small details, I use liquid acrylic paints. Choose a professional artist quality, high pigmented paint. I either use Liquitex or Golden. they slide very well. No need for more water.
Choice of paint is as important as choice of brush.
I paint my details with my Kolinski watercolor brushes. At first I dared not, thinking the acrylic would kill and stick to hair. As long as you clean them quickly, shape the point, and let dry without touching anything to modify the shape, they wil last you longer than any detail brush out there.
For absolutely no brush strokes: try an airbrush
For dusty, almost-airbrush finshes, use the dry brush technique.
find any good book on stencil painting (in Hobby section of bookstores)
The trick is to use a stiff brush (bristle), and use very little paint. Wipe in a circle on a clean surface, until you get the powdery feeling you are looking for, then paint!
I believe the raised details on venetian masks are probably made freehand, using a device similar to a cake decorator (a pouch with a tip).
I tried with a special tube of paint made for just that, but it globs and is hard to control.
I sometimes make twisted paper and use that to make raised detail.
Hope this helps.
Creaturiste
check out my mask section in the galleries of my website:
www.creaturiste.com