the first thing that jumped out at me was the rear end of your lock and counterplate panels. They should terminate at or BELOW the centre line of the wrist, not above it as they are currently. You can still adjust that by removing wood from the top of the panel...the lock position looks fine.
You have lots of cheek piece. It can be better defined by cutting a straight line along the bottom that is on the same plane as the stock from the toe to the wrist. Looking at the stock from the bottom, the cheek piece should appear to be laid on top of the stock. In other words, the stock should taper from the butt plate forward to the lock panels interrupted by the cheek piece. Cut the lower moulding of the cheek piece straighter into the stock, getting rid of the gentle slope. That will bring the bottom line of the cheek piece up from the toe line without removing any of the height of the cheep piece from the stock.
Do not think about cutting lines along the comb to accentuate the wrist or the comb, unless you're looking for the Brown Bess look. The way it is right now is just fine, although you could remove move wood to slim it up a lot.
Your butt plate screw is too high in the butt plate. It should be around 1 1/4" from the toe, not in the middle of the crescent. I had that problem with the little percussion rifle I finished up this past fall...the builder had drilled the hole in about the same place you did. I drilled it out to 1/2" and plugged it with brass rod, and drilled it for the screw 1 1/4" from the toe.
You've done well to draw your parallel lines on the wood...they tell you whether you have the butt stock symmetrical on both sides.
Round off the tip of the comb at the junction of the wrist...yours is a sharp corner there.
You could diminish the height of your wrist at the transition too. Your wrist gets thicker as it goes to the comb. Once you've done that, you can cut down the top of the comb just a bit so that a straight edge along the comb from the heel of the butt plate does not go uphill. A subtle convex curve on the comb line is better than a dip.
Do not be in a hurry with this. You are wise to stop and ask at this stage. I often go back many times throughout a build and take away more wood, even after I thought I was 'there'.