Excellent drawing, and interesting ship i must say, is that on the bow a casemate gun?
That would be the bow chaser gun, found on many vessels of this period. That particular mounting was very popular with French and Russian vessels and continued into their Protected and Armoured cruisers later on.
As for the drawing itself, excellent job. As the others have said I like the shading but it isn't of shipbucket style so may not be permitted for upload without modification.