Not bad, Simona-King, but, a few suggestions:
Since he's a... "some-kind-of-fish-that-has-a-light-on-his-head", make the light-bulb-like thing brighter, like it's shining.
Also, he needs to be wider, and his bottom lip needs to stick out farther. And, there seems to be something poking out from his eye on the right side... and he needs some more shading on his belly-tail area. 
But, good start!
---EDIT---
And, I don't quite see what you're seeing, Shnaps, but if there's something there, I wanna fix it before I get too far into it! And, I'll see what I can do about his hair!
If anyone sees anything with the cape, feel free to let me know! And I'm gonna fix his... scarf thing. It looks too round.
Since he's a... "some-kind-of-fish-that-has-a-light-on-his-head", make the light-bulb-like thing brighter, like it's shining.
Also, he needs to be wider, and his bottom lip needs to stick out farther. And, there seems to be something poking out from his eye on the right side... and he needs some more shading on his belly-tail area. But, good start!
---EDIT---
And, I don't quite see what you're seeing, Shnaps, but if there's something there, I wanna fix it before I get too far into it!
And, I'll see what I can do about his hair!If anyone sees anything with the cape, feel free to let me know! And I'm gonna fix his... scarf thing. It looks too round.