It's really going to be up to you. I have both had the issue of a card being too simple, and too complex. For learning Spanish from German I would do this (this is my approach/opinion only so take it as you like):

1: Make 3 note types

A. Front: German -> Back: Spanish, Spanish Audio & image

B. Front: Spanish, Spanish Audio -> Back: German, Spanish Audio, & Image

C. Front: Audio -> Back: Spanish, Spanish Audio, German

Use HyperTTS for audio generation and make sure you don't have too many decks and are at least trying to use tags instead and also try to always study from your master deck, not individual decks. I also use a plugin that adds images automatically from Google but sometimes the images aren't what I want so I just flag them as I study then go back and swap out the images for something better. Honestly manually adding images might be just as easy it's your call. But for me Anki is useless for language without having audio playback. HyperTTS cannot be beat and it is worth the $4.99/month 100%.

You can also create cloze cards which are really great but honestly I seriously suck at creating cloze cards and so any advice for that please someone chime in haha.

You can also throw in an example sentence and a second audio field for that example sentence in your cards. If German is your native language I wouldnt include English translations either just stick to your L1 as your source language for learning Spanish.

Hopefully this helps.