Lots of constructive criticism: Definitely stay away from pure colors (each part of the model looks like pure black, pure yellow, etc.). Also try to use hard edges otherwise the entire thing will look like it's made out of rubber. The part connecting the handle to the flail is very sickly looking. Perhaps you could make it a chain or something.

The glow is also not something very pronounced. It's just a material setting (i.e. it will glow in the dark). If you actually want a glow effect around the model, it will have to be custom done (usually valve is in charge of particle effects).

Much thanks for your criticsm,
The hard edges you are reffering to is Smooth and Flat Shading ?
for the connector of handle and flail. I ran out of Tris ( I was planning to make a chain ), but since my Tris count is near to workshop limit ( 350 Tris ), I decided to make it into a rope thingy.
The orb on the flail took too much Tris count, even I decimate it into some blocky sphere.

The entire model should be smooth shaded (not flat shaded), but in order for the model to not look like rubber you have to use smoothing groups (in blender these are called edgesplit modifiers). Select an edge that you want to appear "hard" and press ctrl+e > mark sharp. Then apply an edgesplit modifier to your model and set it so that it uses sharp edges. Google edgesplit modifier to see what I mean (I also explain how to use them in the TF2 video).

Regardless with this topic, I decided to remodel the whole entire thing and reconcept it. And faced a new question, will a plane ( 2D model ) double sided ? ( I remember seeing some hero cloak being transparent if viewed upside down ), If not, is there a way to do so ?

For the purposes of Dota and TF2 there is no way to make a plane double sided. You really shouldn't have any paper-thin geometry anywhere in the model, though...