Arms Under Breasts
In ecchi and fanservice anime, the arms under breasts pose is popular. In this pose, the character crosses their arms or places their hands under their chest, which raises their breasts and highlights them. When a character is wearing tight clothes or a swimsuit, artists often use this pose to highlight their figure.
The artists who draw this know what they are doing. Usually, the entire piece showcases curves, shading, and character clothing. A character who knows how good they look often has a smug or teasing look on their face. Classic embarrassed tsundere reaction: character tries to hide something but makes it more obvious. Very focused lighting on the chest highlights cleavage and soft skin.
Adding a photo of this pose to your wall adds sexy, bold energy. It is for adults and has NSFW content, but the art is usually good. Most high-quality fanart for characters with great bodies and strong personalities is in this tag.