Please checkout Kirazy's Artisanal's Reskins of Angel's. They do a much better job at making the graphics better than I ever could

This mod replaces Angel's Smelting plate icons with modified vanilla (64x64) ones. Also with mipmaps.

NOTE: Currently, 64x64 icons are incompatible with Deadlock's Stacking for Bobs (since it expects 32x32 images). I uploaded a quickfix if you want to play with Deadlock stacking and this mod.
https://mods.factorio.com/mod/deadlock-stacking-crating-bobs-quickfix
Once the author gets it fixed, I'll remove this.

Alternatively, use Billbo's Stacking for Bobs and Angels. I tried these and they work fine.
https://mods.factorio.com/mod/DeadlockStackingForBobs
https://mods.factorio.com/mod/DeadlockStackingForAngels