[Merlin's Heir]

I had to. The oceany-ness made me do it. Okay, now for the explanation of colors and so on.
The vivid blue on the head is for the clear blue waters you see in tropical, warm islands (i.e. Hawaii, Tahiti, Bora Bora, etc.). The lighter parts on it is like the sunlight viewed from underwater.
The gray-blue for the spikes/whatevers is kind of like the ocean/sea/lake/whatever on a rainy day. It seems more gray and clouded.
The green-blue on the neck is for the green-blue water of the ocean's depths. The dark blue-green streaks are sort of like seaweed.
The crystal blue of the eyes, under-eye marking, and antennae is sort of like the bright blue of water in the sun. The darker parts swirled into the eye are like the churning waters of a storm.

[Dragon Attack]

I love how you did this! I can't draw water when it comes to shading

[Merlin's Heir]

Thanks. If you're wondering how I did the "shining sunlight" on the head, I just dodged the top and then did quick, short strokes with blend.

[Oρнeℓια]

I also love this If you read the critique on your first entry, it applies here, too. You've captured underwater beauty Just keep in mind that improvement. you're very talented.

[Merlin's Heir]

Thanks! I'll keep your advice in mind, though I don't know if it'd be possible to add a design/pattern without messing up the ones that are already there. Maybe on the horns/spikes, though.