Wow, it's all about the pine cones at the start of this month! Nice sketch, ams, pine cones are seriously difficult to draw freehand (I did try, but I gave up and ended up tracing!) I can see what you mean about the shadows, but couldn't you just darken the deepest bits of those shadows more to fix it? More graphite might not be dark enough, but a bit of black pencil/charcoal, or even ink? I reckon one more layer of super-darks would totally fix that, but it depends if you want to spend more time on it, or move on.