No, I don't think so. That is just your natural cowlick and the way you come your hair (against the grain) may exaggerate the cowlick further which gives the illusion of a thin crown. Your hair density looks great; nothing to worry about. I do see some miniaturization on your frontal hairline and temples, but their distribution seems pretty uniform and it doesn't look like male pattern baldness. Temporal hairs will recede--this is natural, but how much they recede determines if you're suffering from Androgenetic Alopecia.