Thank You Very Much,
I knew while making those wrinkles that there was something wrong with them (visually) but could not put my finger on it and hence could not correct it.
I think I know what you mean by the gradient; it's also visible in the leather band on the hat, except there it's a flat horizontally curved plane. where as the wrinkles sit on a complex plane and curve also in multiple directions. While the hat band appears (at least to me) a bit better resolved, the wrinkles are not part of the forehead and stick out I suppose. the Am I on track here?
I find it difficult to spot inconsistencies while working on something even tho I keep flipping it H & V.
Thanks for the error spotting. I'll have a go at it.