The official Twitter account of Attack on Titan released a special illustration of Gabi Braun. AOT Twitter shared this illustration after the release of episode 11 of Attack on Titan the Final season. Michelle Sugimoto drew the illustration. Sugimoto is also the episode director of AOT the Final season. He directed episode 11 as well.

TVアニメ「進撃の巨人」The Final Season第11話（第70話）「偽り者」をご視聴いただいた皆様、ありがとうございました！
来週の放送もお楽しみに！！

Illustration：杉本ミッシェル（作画監督）#shingeki pic.twitter.com/s2MEIiLvId

— アニメ「進撃の巨人」公式アカウント (@anime_shingeki) February 21, 2021

MAPPA also released an illustration of Kaya:

【放送情報】

TVアニメ『進撃の巨人』The Final Season
第70話「偽り者」ご視聴ありがとうございました！

兵団支部から脱走したガビとファルコを匿い、ブラウス厩舎へと連れ帰った
カヤの総作監修正を公開。

次回、第71話「導く者」
どうぞお楽しみに！ #shingeki pic.twitter.com/IL6KmOHL6B

— MAPPA (@MAPPA_Info) February 21, 2021

Anime Corner describes the anime as:

Over a century ago, mankind was devoured by giant beings of unknown intelligence and origin known as Titans. Creatures that eat humans alive indiscriminately and for no apparent reason. The remaining population has managed to survive the last hundred years only by building a multi-walled city capable of keeping the Titans at bay, training military recruits to patrol the perimeter and gather intelligence about their mysterious foe. Eren and Mikasa have lived a relatively peaceful life behind the city’s walls. But when a massive Titan appears, smashing the outer barrier and unleashing a wave of terror, their lives are brutally changed forever…

Source : MAPPA Twitter account, Attack on Titan Twitter account.