Perform the same pose while looking into a mirror. The thumb should be on the side of the hand that is closest to the face therefore, yes. The hand is wrong.
While you are at it, you should probably look into drawing proportions and anatomy more accurately. For example, the eyes should be on the same level, but one is lower than the other. Also, the arms look too long and too thin. The drawing itself isn't so bad, but there is always room for improvement. Try drawing from references to improve accuracy.