Apologies if some of this is repetive, but there are a couple of different tools and techniques.
Behind the cheek design pencilled in, in the style of Neihart.
Take a parting tool and cut along the lines. I lay the tool over on its side, with one tool lip laid down on the side of the line that gets relieved. The other lip stands fairly vertical. This tool is a 90 Vee. You can also stab this design in, if that is your preference.
When you've cut everything that you plan on, erase all the pencil marks. Then you can see if you have elbows or flat spots in your curves. You can also see the faceted cuts I made with the parting tool laid over toward the relief side of the line.
Relieve up to the line, using the side of the cut line as a rest for the side of the chisel. This is from the forestock, but same process. A fishtail gouge is really neat for this work, too. A #3 sweep, 6 to 10 mm wide is ideal.
Blend the background down with a flattening rasp. Fair it out as far as practical, and tip the stock in the light to make sure the divots and bumps are all flattened.
I made this rasp. Takes a couple of hours to do so, but it saves centuries of leveling with a scraper. This tool is very aggressive, with pointy little teeth like a Jack Russel, so take it easy with the pressure. Make the shape you want, then raise little teeth with a graver or small chisel. Then harden. Use spring steel or 0-1. This one is low carbon steel, case hardened. Pain in the butt to go thru that process for one tool.
View of scraper I use. 1/32 thick 0-1 tool steel. I hardened it and drew it back to spring temper. Lately I have been simply grinding the end square and sides flat, ie: not rolling a burr.