Hey Navi! Nice job here! I have some minor comments, hope they help you to push the illustration :) First, I would make the submarine bigger. The scale of the character compared to the submarine… well, it makes the man feel like a giant :p So the first step would be to raise the horizon line and clearly draw that flat surface to avoid a “double view,” so to speak. Then I’d increase the size of the submarine and let it go out of the canvas to better communicate its scale. On the other hand, I would place the ship on the left side and make it much smaller. I’d also slightly reduce the size of the diver. Some subtle light rays filtering through the water would work really well :) But most importantly, I’d give more importance to the object the diver is trying to reach. Because of that, I’d add a bit of rim light on the diver to reinforce some of the contours (just like you already did). Hope this helps!
