First of all, I scanned my drawing and imported it to Adobe illustrator.

I created a layer. Then I used the pen tool to draw the outline in that layer. After that, I inserted the suitable colors and changed the stroke.

I continued to draw based on my sketch until i became satisfied with my product.

I did some adjustment for position and scale certain object in my logo to make it more appropriate.
After several drawing, coloring and certain adjustment, I manage to complete my own design logo.