Heyheyhey, it's really neat, but I noticed you're using 100% black and white, don't use that! >.< Also you seem to be pillowshading, it might be okay on this weapon since it's a firework, and not really a sword in this case. It has good shape but I'm not too sure about the top piece so I made a little edit. Not sure if I even made it better since I'm a big noobie with gfx, but take it as a reference for the shape.
Attachment 10502
Also try to add more contrast to your colours, your colours are dark. o: