Keep a clean wet, wrung out washcloth next to you while you work. If you apply a streak that just doesn’t look right or has too much paint, grab that cloth and wipe that streak of before it dries and needs to be sanded off. BUT, this would only work if you are dry brushing in spaced out streaks as shown in the picture and not trying to cover the whole piece. If you are covering every square inch of the piece with dry brushing and you wipe some of it away, you could end up with a real mess. In that case, sanding would be better.
Depending on the look you are going for, you could finish the piece off with a glossy or satin clear coat of polyurethane. Another option, that will smooth out any mistakes, would be to do a light sanding over the whole piece with 320 – 400 grit sandpaper and then clean it off. From there you could do a layer of furniture wax or a coat of polyurethane, depending on your preference.