Your practice block looks like either ramin or furniture grade walnut. And your attempting to lay it out across the grain. Use close grained hard wood, and lay your practice pattern (if that's the way your stick floats) lengthwise with the grain. When you make your chisels, use a 3/32" chain saw file to create a 3/32" wide sweep, filing the back side to make the same curve as the concave part, and finish up your little curls with it. You can make a number of these in 3/32, 1/8, etc. But a 1/16" flat chisel will create tight curls too. You have done well to place your dots so that the flow of the outside of the curve continues with the edge of the dot.