Very good, excellent job for a first drawing. Not without things to comment about so here they go:
From stern to bow:
Free standing structures bigger than 1 foot as seen from the side should be outlined in black, I've shown them on your drawing. These are mainly air intakes in this case.
The skeg and rudder, while under the ship and covered from light, are vertical to the viewer so they should be painted on the base colour.
Any surface meant to have people standing on should be 3px thick and correspondingly outlined in black.
We draw portholes with 1 or 4 px of "blue" "sky reflection" colour, (a very rich deep garish looking blue in classic SB drawings) surrounded by a black pixel outline, in this case the 3x3 with 1 blue pixel probably fits better. If the portholes don't have glass then its up to you how to display them but i've done them as open squares with a very dark grey filling.
Funnels and other large cilindrical structures benefit from highlighting on the face pointing towards the light source (top right), the palette you've chosen has a lot of contrast so this looks a bit exagerated right now.
The front air intakes kept going below the deck on the bow.
Overall pretty insignificant issues that don't detract from a fantastic entry into the forum. Once again good job and welcome.