It's good for a start but does need a bit of work. The outline needs to be crispier and smoother.
The right (my right) leg is awkwardly bent and the right arm (same side) resembles an amputated limb. The pokeball in the left hand is practically indistinguishable.
Final point of criticism is that the sprite itself is way too small. http://www.pokemontopaz.net/repository/trainersprites/
As you can see, these trainer sprites dwarf yours. Even the too-small default male. Sorry to rip it apart but trying to help by giving constructive criticism.