Why are this characther's hands not mirrored while I model it? I'm trying to learn how to model a little boy and I got stuck. Infact I'm not able to understand how to align the hands. I've tried both,in edit mode and in the object mode,but the left hand is always not parallel with the right. How can i fix this little problem ? I attached a picture to show you.
1st turn off clipping in your mirror modifier.

In object mode be sure to ensure that rotation and scale are applied Ctrl + A.

Next turn off increment snapping Shift + Tab.

Next set your cursor to the origin of the body.
With the body selected as it is here: Shift + S, Then Cursor to selected.

Next Apply your 3D cursor to the origin: use the . key on the qwerty not the Numpad.

Then Re-Apply the modifier settings.

From the screen-shot above you have a lot going on, so these steps may not be the right answer, but they are definitely worth a shot.

If this still does not work for you, please attach the blend file, so the community can take a look and see were the problem resides.

Hope this helps,

RRiggs