I'm terrible when it comes down to drawing with paper & pencil and my only way of expressing myself through art is through graphic design & photography. Here is a random piece I did when I was bored one day - I couldn't fall asleep one day, and I saw this picture - and decided to try my own version. I realize mine isn't even half as good, but I had fun doing this.
The second piece looks absolutely professional. The quality of the 2nd one made me to believe that you could do better with the 1st and 3rd one.
About the 3d one: the edges where the water meets the walls (on the ceiling) look too straigth and for, it ruins the realism, apart from that it's great, good job
Nice work dude.Just giving some shadow details and varying contrast in 3rd pic will give a realistic look. You can also try blurring the back portion little bit just to add more details.
Thanks for the feedback guys, really appreciate it. I will be updating this thread regularly with new pieces.