I have:

While we appreciate the nice looking preview, we ask you please use the official preview generator. This assures the path has been combined properly and allows us to evaluate the design against the grid, which is very important.

Here is what it looks like with the standard overlay / cutout size.

Added:
clipboard-editclipboard-edit-outlineThanks! @goyney sorry about that, I didn't see it. Next time I'll do it 馃槃
Not a problem. I've actually had talks with @Templarian before about making our previews look nicer. 馃槃 The grid is the most important part though.
Yeah, the grid is important, but it would definitely help if you could also see the icons in light and dark mode colors like in the preview OP made.
I totally agree @goyney! The functional value of the grid is clearly needful 馃槃 I feel happy to help, let me know if you need something 馃憤
Most helpful comment
While we appreciate the nice looking preview, we ask you please use the official preview generator. This assures the path has been combined properly and allows us to evaluate the design against the grid, which is very important.
http://dev.materialdesignicons.com/contribute/github