As you see in the title, this is an enhancement issue.
The entity like item frame is really sharp compared to other blocks.

Change minecraft/shaders/include/light.glsl can disable entity shadow and item model shadow.

"I'd say this is a vast improvement." Anyways, I might look into ways to not apply it to everything all at once. For now, I think it can be an "experimental" resource pack that's available with the mod. (Yeah, it actually got rid of any shading that wasn't covered by the mod it seems)