not bad to start with... I've had a shufties and done this little edit...
I've manipulated the pallette a touch...added a blue tinge to most of the colors, Increased the instensity of the sword pallette... this makes it really vibrant and more neon like... I've also manipulated the left hand... added 'fingers' - always helps to make a pose more dynamic... I've flared the bottom of the robes too... to add movement... I also pulled the sword hand out a bit to increase the negative space between the body and the arm... (could do with more distance I think - couple of pixels over) and I pushed the head up a touch and modded the pixels around the face.
I've added a bit of lighting for you from the sword... It's not perfect but it's a push in the right direction for you...
keep up the good work, have fun and good luck.
Pete
PS - oh and in retrospect I guess the light saber should be blue?