This is my final work.

At first,I made a rectangle by rectangle tool and colored it by blue as a background.Then, I drew a slanted line and made a cone by appearence.I choose linear type for the color.I choose yellow color for the hat as well.After that, I made a rounded symbol and mapped it by 3D effect.

I drew lip by pen tool and added to the hat just to make it like a human.Then I drew the eye by rectangle tool an colored it.

In this step, I drew foot, hands, and shoes by pen tool and colored them.Then,I added ribons to the head of hat.After that, I colored it by gardient/radial type.I just changed other color of ribons to orange,yellow andred.

Then, I drew the lines and clored it by gardient/linear type.

In this step, I drew the cake by pen tool and drew creams as well.then I rendered it by a light brown.then, I colored them by gardient/linear type.Then I made some strawberry seeds by pen tool and added to the cake.finally, I put one of the candles on it.Then, I just copy a few of them in the lines.

Then, I drew a candle and colored it by gardient /type radial.However,I colored the bottom part of the candle by linear type.I made it smaller and put it in the wavy lines.