Thank you for the criticism, Eishiya. Updated with an attempt to fix the dots and added some roughing to the sides of the white one.
The resizing is probably redundant but I kept it since these don't look too good at 100%.
No need to post a zoomed-in version, PJ has a zoom feature :]
The pixelling looks good overall, and the colours are well-chosen! It's not easy to present such a plain subject in an appealing way, and you avoided the usual pitfalls :] I have three critiques:
1. The dots aren't equally spaced from the edge, and are too close to the edge for the most part. Some imperfection is fine and even good, but if you have too much, it looks unintentional.
2. The "fading" highlight on the front edge on the white die looks good, but suggests a rough surface, while the other corders suggest a smooth surface. I think the roughness is good and I think you could apply it to the other edges.
3. It looks like you copy+pasted the dots from the vertical sides onto the horizontal (top) size, and it looks wrong, like it's on a slope rather than a flat surface. The horizontal side is seen from a slightly different angle than the vertical sides, so the dots should be distorted in a different way. Since this is isometric, the horizontal dot should be a slightly flattened circle, something much easier to achieve than your vertical dots. The vertical ones look fine.
Something's a bit off about the angles on the second die. The top and bottom don't look like they're symmetrical.