I had a few minutes while waiting on a render this morning to load it up and I think it looks great.
I see what you mean about some of the new textures being OK enough... the potatoes, apples, quartz, etc aren't as nice as our 1.13 icons, but they're fine, and I think it's good to have a few more of the 'stock' icons included. Though, your new lingering potion is
very fancy and makes me want to use those more
. I think the only thing I would change is the bone meal – maybe to the stock icon – because it looks a
little too close to the new white dye icon.
Thanks for taking the time, Brad, and nice work, as always!
[edit]: Holy crap I just discovered the custom UIs for the job site blocks....