On PedVariations.dat, CTRL+F and type M_Y_PrisonBlack to find the line,

Copy and Paste the line UNDER and replace this on PedVariations.dat

M_Y_PrisonBlack,		7
#slot		geometry	BULK	JOB	SUNNY	WET	MAT1	RES1A	RES1B	RES2A	RES2B		AUDIO ID
head,		0,		0,	0,	0,	0,	0,	-1,	-1,	-1,	-1,		6
head,		1,		0,	0,	0,	0,	0,	-1,	-1,	-1,	-1,		0
head,		2,		0,	0,	0,	0,	0,	-1,	-1,	-1,	-1,		0
uppr,		0,		0,	0,	0,	0,	0,	-1,	-1,	-1,	-1,		15
uppr,		1,		0,	0,	0,	0,	0,	-1,	-1,	-1,	-1,		15
lowr,		0,		0,	0,	0,	0,	0,	-1,	-1,	-1,	-1,		3
feet,		0,		0,	0,	0,	0,	0,	-1,	-1,	-1,	-1,		3
end

save the file and move to 7 - PedPersonality Guide