Just Make Paintings Transparent
Make paintings (and a few other entities) support translucency
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Just Make Paintings Transparent
Just Make Paintings Transparent is a mod that makes paintings (and a few other entities) support multple forms of transparency, for use with resource packs.

The entities supported so far are: - paintings; - end crystals; - and item frames (glow item frames included).
By default, all supported entities are set to TRANSPARENT. A config file is provided to let you individually select the transparency level for each entity, found as jumapat.mcf in your game's configs folder. The valid choices for each entity are TRANSPARENT (the default for the entity), TRANSPARENT (equivalent to CutoutNoCull) and TRANSPARENT (equivalent to Translucent). If you don't understand what any of this means - unless you're optimizing for every last bit of performance, the default settings should be good enough.