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When creating pictures 15 and 16, I had a certain concept in mind, and it largely revolves around contrast. The main idea wasn't so much the visual aspect, but rather an attempt to convey... uh... inner feelings.
Sesam seems to me to be a very sociable, energetic, and cheerful person, full of life; as for me... well, I'm just like that, and I think this picture conveys the essence quite well.
By the way, there are two girls depicted there, although some might think it's a boy.
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So, what do you think?