Declension table of ?kṛṣṇamukha

Neuter	Singular	Dual	Plural
Nominative	kṛṣṇamukham	kṛṣṇamukhe	kṛṣṇamukhāni
Vocative	kṛṣṇamukha	kṛṣṇamukhe	kṛṣṇamukhāni
Accusative	kṛṣṇamukham	kṛṣṇamukhe	kṛṣṇamukhāni
Instrumental	kṛṣṇamukhena	kṛṣṇamukhābhyām	kṛṣṇamukhaiḥ
Dative	kṛṣṇamukhāya	kṛṣṇamukhābhyām	kṛṣṇamukhebhyaḥ
Ablative	kṛṣṇamukhāt	kṛṣṇamukhābhyām	kṛṣṇamukhebhyaḥ
Genitive	kṛṣṇamukhasya	kṛṣṇamukhayoḥ	kṛṣṇamukhānām
Locative	kṛṣṇamukhe	kṛṣṇamukhayoḥ	kṛṣṇamukheṣu

Compound kṛṣṇamukha -

Adverb -kṛṣṇamukham -kṛṣṇamukhāt