"poco de belleza" would mean "a little bit of beauty". "La guerra tiene poco de belleza" would mean "war has little beauty". If you mean "a small attractive girl", then it would be "belleza pequeña".
"Kleiner Schatz" is the phrase you are looking for.
little treasure in spanish is pequeno tesoro
Pequenia tenda ( PE-ke-nia T-en-Da)
tesoro perdido
"regalo cheqeto"
Little mouse in Spanish is ratoncito.
Treasure is tesoro in Spanish. wordreference.com
'petit trésor'
The Spanish word for 'little piggy' is 'cochinito'.
Tesoro - Spanish for treasure
poco
'Your little sister' in spanish is written and pronounced 'Tu hermana pequena'.
Poquito or poco.
Campanilla
poco
un poco
Besitos
perrito