When you first posted the shark dude up I was floored like and I found myself saying "This dude just started this artblog and boy has he started strong af!" Its awesome and inspiring and your process visually looks very indepth and takes into consideration the feel of the character - which I try to emulate in my own work.
The weapon design is very, very sound with the universe and style of the Shark dude character. As for the Space-Compass, perhaps incorporating some Astrolabe designs can lend more to the nautical theme?