It's not bad, but I think you lost the energy and expressiveness of the reference. While in the original bust it's clear that the expression is somewhat typical and natural to the character and somewhat buried in, it's still skin, fat and muscles being displaced into this expression. In your case it looks like a somewhat stiff and superficial equivalent of that grimace frozen into the physiognomy, especially on his left side. It looks like many of the forms like the brow are simply that way with the different tissues more or less draped over or hanging from it. Part of this might be due to a lack of depth and sharpness, but also the forms aren't quite right. Image for example how your character would look if he wasn't grinning at all.
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Here is the texture for the Pirate, inside Substance Painter rendered in Iray.
Here is the reference for the texture.