Couple of suggestions . . . I like where your main light is, but personally would like the "rim" light to be further back, a little higher, and maybe half as much power. Think increasing your contrast in camera with greater difference in power from the second or third lights.
The goal in portraiture is to make it look like there was only one light source . . . like in nature . . . only one sun. The additional lights should be fill and not be obvious as a second light source.As for the pose . . . your hand looks too large and would be better on the other side of the face, not obscuring part of the face.
If I was just learning portrait lighting I would probably take my first hundred shots with only one light until I mastered the angle, intensity, distance from subject, etc. . . . then and only then would I add additional fill or rim lights.

Just my nickles worth. (used to be three pennies worth, but in Canada, no more pennies . . . everything is being rounded up) :mrgreen: