Elvennotes
Full art:

Name:

“Choir Elvennotes”

TL note: 聖歌隊 (seikatai) is the word for “choir”, but if one takes each character individually, it would mean something like “Sacred Song Corps”. It is possible that the author wants to imply that meaning. “Elvennotes” itself is written in many different ways through the cards, but not with this particular word.

Litera’s hometown:

Left picture: “Design of Litera’s hometown” “Bud of The Great Erlking”
Right picture: “Details of the bud design” “Ominous aura (corroded by the [Elvennotes] Power Patron)”

Lantern grass:

Trees:

Top: “By pouring some mana into it, it reacts by emitting light. Used as a replacement for electricity.”
Bottom: “-Lantern-like pistil (Can also be seen in the bud)”
“-They live inside the trees”

More plants:

“Designed after the [hozuki/bladder cherry]. Have a jellyfish appearance.”

More plants #2:

Right: “<- Growth"
Top-left: “The core beats like a metronome”
Bottom: “Semi-outdoors dome”

Design motifs:

Left: “Horns”
Right: “Branches and leaf veins”

Colors:

From left to right: “Water” “Fire” “Light”

Volume:

From right to left: “Thin -> Thick”
Bottom: “Designed as if the voice is spreading around”

Bud:

“Turns poems into songs and offers them to The Great Erlking”

Bud details:

Left image:
-Top: “Bird of paradise flower”
-Bottom: “Madonna lily (6 petals)”
Right image:
-Top: “1 is thin (upper sepal)”
-Bottom: “Long (spathe)”

Local specialty of the forest:

Artmage Non Finito
Full art:

Top right: “An incomplete contract with the Power Patron…?”

TL note: The particular Power Patron mentioned here is Artmage Power Patron by its title, “獄神獣” (imprisoned divine beast)

Bottom left: “The power is going berserk and overflowing”

Source.