Yup. You're still using a lot of ditherings, and the reason for doing so evades my understanding...

It's JPEG compression, not dithering.
Please save pixel art using non destructive formats like gif or png, and upload them on sites like imgur. We can't really appreciate the pixels here.

It looks pretty solid and the line art is clean, however you should avoid putting too small details,
because it feels noisy instead of detailed, and you will lose the pixel art feel. If you take a look
example image you linked from Fool, a pixel art master, you will understand that the pixel art
feeling comes from small shapes carefully drawned by hand, and not pixel-sized noise to emulate
the rock texture.

Also, before detailing that much, you should think about the overall composition. No foreground
or human silhouette on the foreground ? What's in the background ? From where your light is coming.

The  biggest issue of your picture is the famous pillow shading. You shaded your shapes bright in the center
and darker near the strokes : It looks very flat and uninteresting. Try to make a choice with lighting. This is
like the "default mode" of any 3D software or like using a front flash for photography.

Still the same issue on my mac after the fix.
Haha I feel sorry for you, the feedback is pretty harsh here.

Your specular is too thin & bright. It almost feels like vector art.
That's why they looks like glassy mushrooms. If you soften the
lighting and make the specular larger, it would feel more 'correct'.

A little edit :


Of course you can adapt the general concept to your cartoony style.