This resource pack is renamed to Vanilla Mending now! Compared to "improve", "mending" is a better word to reflect feature of this pack, which has several common points with the enchantment in Minecraft, to some extent.
Additions
Cherry & Bamboo Door items. I have to say that the new texture maker have made them too detailed, only to make them inconsistent with Minecraft art style...
All colored Shulkers and Shulker Boxes
Changes
Renamed the pack name to "Vanilla Mending" and changed the pack description
Red Wool. It's no longer too purple
Normal Arrow item
Bow item with arrow
Arrow entity
The "shaft" of Mangrove Door, block and item
Iron Golem (details)
Updated Armor Stand entity texture to match the Bedrock Edition pack
Fixed wrong pixels in light blue Shulker texture
Slightly changed the top and bottom sides of the rod of Blaze
Fixed the issue that Report Draft icon missing
Removed some unused pixels of mob texture maps to match the change in 23w31a