G2g to bed, so I'll post quick. Usually I post longer. Looks good for a first stock. Keep at it and you'll be great at 'em. Just tone down some of that sharpness on the sides. Makes a better focul when the sides are more blurry than the center. Good work
The trick with using stocks is to use the background of the stock to create depth and a feel to your sig. Completely covering the background with grunge/vector/spatter brushes means you might have well just used a render.