This is certainly a worthy addition. But yes, I agree with Novice, perhaps going further by querying the overall shading policy? This isn't 'cast in stone', but generally the direction of the light comes from the bow aft; so the lighter shade is shown facing forward, and a darker shade facing aft: this is on surfaces like funnels, bridge fronts, sponsons etc. were a rounded surface is indicated. Also, varying the hue is best done by more subtle degrees, so that on first glance the effect is what is desired - a rounded surface. With this drawing there is also some other shading that I cannot place, in the context of what is being indicated - I'm looking at the raised deck aft, under the light aa. Generally, with the anchors fore and aft, the shading shows the light coming from both directions.
This is secondary to what is trully an excellent drawing