das Nacktfoto
nude photo
A photograph that shows one or more naked people.
Die unerlaubte Veröffentlichung privater Nacktfotos ist strafbar.
The unauthorized publication of private nude photos is a criminal offense.

nude photo
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nude photo
A photograph that shows one or more naked people.
Die unerlaubte Veröffentlichung privater Nacktfotos ist strafbar.
The unauthorized publication of private nude photos is a criminal offense.

The word is a clear compound made up of the adjective 'nackt' (naked) and the noun 'das Foto' (photo). So it literally means 'a naked photo'.
Der Künstler ist für seine Schwarz-Weiß-Nacktfotos bekannt.
The artist is known for his black-and-white nude photos.
With compound nouns, the last word always determines the article. Since it is 'das Foto' (the photo), it is also 'das Nacktfoto' (the nude photo). This rule applies to all compounds.
Es heißt „die Schnecke“, also auch „die Nacktschnecke“.
It is 'die Schnecke' (the snail), so it is also 'die Nacktschnecke' (the slug).
In connection with 'Nacktfoto' (nude photo), verbs like 'machen' (to take/make), 'verschicken' (to send), 'veröffentlichen' (to publish), or 'verbreiten' (to spread/distribute) are often used. These verbs often point to the private or legal context of the topic.
Er hat ihr ohne Erlaubnis ein Nacktfoto geschickt.
He sent her a nude photo without permission.
act / nude / hassle
'der Akt' and 'das Nacktfoto' can both show a naked person. However, 'der Akt' is used mainly in art, for example for a painting, a drawing, or an artistic photograph. 'das Nacktfoto' is more precise when you really mean a photo that shows a naked person. It does not automatically sound artistic. The words can be confused because both have to do with nudity and images. If you want to emphasize the artistic character, 'Akt' is more suitable. If you simply mean the type of photo, 'Nacktfoto' is clearer.

Sie wollte nicht, dass ihr Nacktfoto im Internet erscheint.
She did not want her nude photo to appear on the internet.
Im Museum hängt ein Akt aus dem 19. Jahrhundert.
There is a nude from the 19th century hanging in the museum.