Can you rate my drawing?

I'd say it's pretty alright. It's much better than most people could do and you have good drawing potential. You just have to use the right shading technique. It's hard for me to rate it because I have no reference to compare it to, if you even used a reference. I think it needs a little more shading because it looks halfway between a line drawing and a line drawing and as if you were beginning to shade it more realistically. Also, a tip to make a more realistic drawing is to not use lines at all, and let the contrast of the high lights and low lights and low lights define the lines. Like the coral at the bottom for example. You could have partially shaded the background around it to form the shape of the coral instead of drawing the lines. I'm going to rate it as a line drawing though, because it's not fully shading. I'd give it a 6.8/10.