תרגום - ספרדית-אנגלית - un beso suave

Hi Goncin,

"gentle" or "soft" would convey the original better.
"smooth" means "suave" in the sense of not having roughness or bumps or ridges or irregularities; you can use it for "skin"
"a smooth skin", but for a kiss it would be better using one of those suggestions above.