noun
tearful face; crying face
Refers to a face wet with tears, often used in the set phrase 吠え面をかく (to cry in frustration or regret).
あとで吠え面をかくことになるぞ。
You'll be crying about it later.
彼は負けて吠え面をかいていた。
He was crying with a tearful face after losing.
泣き面 also means a tearful face, but is more general; 吠え面 is stronger and often implies frustration or regret, and is almost always used in the phrase 吠え面をかく.
Compound of 吠え (continuative form of 吠える 'to bark, to howl') and 面 (face). The image is of a face contorted like a howling animal, i.e., crying loudly in frustration.