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Good that you got filberts. They provide multiple mark making advantages. Main thing is the soft rounded edges. People may disagree but they are like all purpose brushes. You can produce flat marks, scumble, blend, dry brush with the advantage of having softer rounded edges. Use the sides to produce longish lines or thicker round brush like marks. Get the long bristle ones. You can also use the sides with a very loose grip to produce irregular marks for foliage. Your flats will become like filberts later. Flats can be used to pull an edge like bricks, walls and cover large areas (fliberts can do this too). Thicker rounds can be used for scrubbing brushmarks to cover areas loosely. Smaller bristle rounds for details like long lines of thin trees and minute detailed spot