Name the acoustic role, not only the instrument
Acoustic guitar can be a rhythm bed, fingerpicked motif, intro pickup, percussive strum, or quiet harmonic support. The prompt is stronger when it explains what the instrument does.
Pair the acoustic role with vocal distance and room tone. Warm close vocal, small room ambience, and natural tape texture give Suno more useful direction than acoustic alone.
Prompt examples
Warm acoustic prompt
Warm acoustic folk-pop, fingerpicked guitar intro, intimate lead vocal, minimalist percussion, nostalgic chorus hook, smooth room-tone outro
The prompt defines guitar role, vocal distance, arrangement density, mood, and ending behavior.
Keep the arrangement intentionally sparse
Acoustic prompts often fail when they add too many production layers too early. If warmth and lyric clarity matter, keep drums, pads, and backing vocals secondary.
Use minimalist, gentle, intimate, or natural room tone when the song should stay close. Use layered only when you want a specific final-chorus expansion.
Decide how polished the finish should be
Acoustic does not have to mean raw. You can ask for polished natural mix, analog room tone, soft compression, or a clean vocal-forward master.
The key is to avoid contradictory signals. A glossy club-ready finish usually fights an intimate acoustic prompt, while smooth or warm polish supports it.