What should i do to make it better?
Better isn't really "better" unless you're happy with the results, but there are some things you could do to make it look a little more like it belongs in Aqualand.
First, if the sky and clouds are part of the icon and not just a desktop showing through, they should probably be chopped out and left as transparent areas. Iconfactory will automatically deal with the mask shape for you.
If you want to keep the sky, it's a good plan to still add a transparent margin so that the icon doesn't slam against its neighbors in places like the dock. A quick fix would be to reduce the image to about 116 x 116 (nothing magic about that number, experimentation's fine), then change the canvas size to 128 x 128. If you stick with a rectangular icon, add a small drop shadow from directly overhead, around 15 or 20ish % opaque (use stock Mac icons for reference). Still, with that sky, it's going to look on the desktop like a picture of a disk enclosure, instead of an enclosure. The other icons are sure to laugh at it.
In Aqualand, devices (disks, printers etc.) are normally compelled by a powerful and mysterious force that aligns them to the front of the screen and forces them to be viewed from slightly above. Third party devices, perhaps due to their alien origin, sometimes escape this force, so you can get past with the photos you're using. It is very unusual for anyone in Aqualand to face the left of the screen, you may want to flip your image so that the other icons don't think it's rude.
The electricians' union in Aqualand is powerful, and its members refuse to install lights anywhere but the ceiling. It's a really nice enclosure you have there, and it would be sad if anything
happened
to it because it got too near an unauthorized side light. You may be able to fix this up with PS lighting effects, if you know what's good for you.
At the same time, the enclosure still wants a shadow, but not a plain old drop shadow (because that will make a 3D object look like a cardboard cutout). The icons for Preview, GarageBand, Automator will give you a good idea of how the lighting looks in Aqualand. There's no need to get too fancy with the shadowing, a blurred black blob or two in the right places should be enough to satisfy the local inspectors.
The interference pattern on the right-hand enclosure is a little weird. The grille on the left is much nicer to look at.