forelock, bangs
鬋 centers on the hair at the front of the head: the forelock or bangs that hang over the forehead.
鬋 combines 髟 (hair) with 前 (front), suggesting the hair at the front of the head. The exact historical development is uncertain, but the component structure is consistent with a semantic compound.
The top component 髟 represents hair, and the bottom component 前 means front. Picture the hair that falls at the front of the face: the forelock or bangs.
For セン, imagine a stylist cutting your bangs and saying 'Send them forward!' Send -> セン, and the bangs fall into place.
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