Llamas and Alpacas

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Every image can be answered by a word that starts a common phrase of the form "___ and ____," where the given length is the length of the end of the phrase. The second numbers are indices, which are used to index into the second half of the phrase. Moreover, each of these phrases fits into one of the categories listed at the top.

PictureSecond partIndexLetterCategory
PARKSRECREATION10NTV show
ARSENICOLD LACE1OPlay
ALEXANDERTERRIBLE HORRIBLE NO GOOD VERY BAD DAY17NChildren's book
ROMEOJULIET2UPlay
PRINCESSFROG4GDisney
ROCKROLL3LMusic genre
JAMESGIANT PEACH2IChildren's book
MORKMINDY3NTV show
PEANUT BUTTERJELLY2EFood
RHYTHMBLUES5SMusic genre
MACARONICHEESE5SFood

This gives the clue NON-UGLINESS, and it ought to be in the remaining genre that has not been used twice, namely Disney movies, where the second word has length 5. This gives BEAUTY AND THE BEAST, so the answer is BEAST.