The spelling of the phrase 'haddest a picture of' can be explained using IPA phonetic transcription. 'Haddest' is pronounced as /ˈhædɪst/, with the stress on the first syllable. The ending '-est' indicates the second person singular past tense form of the verb 'have'. 'Picture' is pronounced as /ˈpɪktʃər/ with the stress on the first syllable. The word 'of' is pronounced as /əv/, with the stress on the second syllable. Therefore, 'haddest a picture of' would be phonetically spelled as /ˈhædɪst ə ˈpɪktʃər əv/.