Develop an Color By Number App

I am looking for a developer capable of cloning / creating an application of the type "color by number".

examples:

https://play.google.com/store/apps/details?id=com.pixel.art.coloring.color.number

https://play.google.com/store/apps/details?id=com.iceors.colorbook.release

https://play.google.com/store/apps/details?id=com.artlife.coloringbook


- Preferably in Unity.
- Ads and integrated purchases (admob)
- No need for a server for images.
- Only for android phones.
- It is not necessary for the developer to design images, he must develop a simple and fast way for me to add my own designs.

Please:
- Time of development.
- Show portfolio (better if you have worked on similar projects)

Thanks for your time.