It is very comfortable using VNC over USB since you will not need a network connection. Just follow these steps:
- x11vnc should be preinstalled; if not use opkg install x11vnc
- Type x11vnc -bg -o %HOME/.x11vnc.log.%VNCDISPLAY -auth /var/run/gdm/auth-for-gdm*/database -display :0 -forever
If you do not understand what the command is doing refer to the x11vnc help - now try to connect with your favourite VNC client (192.168.7.2)

Best,
MrJordn