A commendable effort.
I have some remarks, though.

Fist is of purely formal nature: standard template, PLEASE.
SB template must not be smaller than 1000 x 330 if ship is shown only above the waterline, or 1000 x 385 if it's "full" - like one here. ( http://shipbucket.com/wiki/index.php/Sh ... _Templates )
(I'm sorry, but after the problem with Olekit24's works, I'm going to be very strict about such "formalities")

Second, regarding the drawing itself, is that on your drawing the hull is (from the bow) a very shaky arc, then a straight line parallel to axis of symmetry, and gets narrow aft, but it seems to me, that it should be more of an arc all over - and particularly I mean that place where "bow arc" joins the "straight line" in the middle - I strongly suggest You make it smoother.
http://www.modelwarships.com/reviews/sh ... eview.html

And lastly, regarding the color palette - one thing that the "main" colors (light highlight/highlight/base/shade/dark shade) seem to me to be almost entirely different colors each, instead of being simply same color of varied brightness.
Also, as I suggested (to other users) elsewhere, I'd make that brightness variance regular - and larger than You did, to more effectively represent shades/contrast ("Lum" values - whatever it is, but in Paint I use that's what shows brightness - they are 219/213/206/190/181 - I'd make them separate by value of 20). Also, You have separate "base" and "above-water shade" for hull. Either I'd use the same color as for superstructures, just "one step darker" - that's the way it's suggested in Style Guide (so what's "base" on superstructure would be "highlight" on hull), or - and that's what I'm doing - I'd indeed make separate set for hull, but still using same color, just with different brightness values than for superstructure (so if a "base" for superstructures is, say 100, then for "hull" would be, for example 90 - a "shade" for superstructure would be 80 and for hull 70 etc.)

Looks better now for sure.