Design 3 vector cupcakes starting from one already done

The job is very simple and it should start immediately: I'd need you to modify a vector cupcake that I already made (it's attached!) to create 3 more cupcakes (chocolate, cinnamon, coconut).
The most important thing is that you should keep the style I already have.
It shouldn't take more than an hour for a skilled designer, but right now I don't have the time it would need me to get it done.

Only thing: I'd like you to use Sketch (http://www.bohemiancoding.com/sketch/ - Mac app for vector graphics) to design them, this way I could still work on them in the future, or eventually save them in a compatible format.

I'll give some tips about colors and show a mockup of the web page to the designer to which the job will be awarded to.

Thanks!