Definitely looks way better now. Not much more you could do with the body of it, IMO. Maybe, the white could occupy a still smaller area, with sparse dithering covering more area towards the edges of it. And the layers of dithering on the front of the sub could I think be made more round, as currently they seem to define an odd shape.

Edited the dithering, removed some white from the top of the sub. Still needs more work I think, but looks a lot better. Thanks for the suggestions!

its nice, but the dithering change is just too harshely changed

Thanks for your comments! I'll have a play with your suggestions and see what I can come up with

First, a note on the preview: it's a bit boring. I think you should generally include at least some hint of the real substance of the picture in the preview. The piece:

The first thing I notice is your colour transitions are very abrupt. Larger areas of dithering and more dithering patterns would be of great benefit to you. In order to make the transitions smooth, the area of each colour should be of approximately equal width. Dithered areas count as separate colours for that. Another point, about the highlight: I think you've overused white in that. The white area is simply too big to be effective. Apart from those things, you might try to add more definition to the rest of the sub, maybe by adding 1px-wide lines to show what's on the surface.

Hope this is helpful to you. Happy pixeling