Right
丁 supplies the sound directly — dīng, no shift. Same phonetic in
订 dìng (order),
顶 dǐng (top),
钉 dīng (nail),
叮 dīng (sting).
丁 itself depicts a nail with head on top, shaft below. 'Nailing the eye on something' is a happy mnemonic for
盯's locked stare.