Strength score decrease by 2 as whell as their maximum.

Your charisma increases by 2 as whell as it maximun.

Living Dolls can live until their body is completly destried as such you can live easly for more than 100 years. 

Your size is between 2 and 4 feet tall and average about 10 pounds. Your size is Tiny or Small.

Your base walking speed is 10 feet, but you can fly 30ft this fly speed have the hover property

Your eyes imbued whit magic allowing you to have 60ft of darkvision.

You have advantage on Charisma saving throws and charisma based skill checks. 
You can chose one proficiency of the following, persuasion, deception, preformance, or intimidation.

You can speak, read, and write Common and another language of your choice. start at level 5 you gain a telepathy that you can use to speak to a number of creatures equal to your proficiency bonus this is a one way telepathy and it have a 30ft range.

As a Doll your body isnt alive.
You are a construct 
You dont need to eat drink, breath or sleep 
You cant be aged magicaly nor put to sleep by magic or spell like efects.

Your doll body can be made of diferent materials, chose one of the material variants as your body type. the benefits of the body tipe add to the racial features 

Iron Doll
Your metal body gives you the following benefits 
your Ac increase by 1 
your Charisma or Constitution score increase by 1 

Porcelain Doll
As a Porcelain doll your body and your mind gives you the following benefits 
you have imunity to fire damage but vulnerability to force damage 
your Charisma or Inteligence score increase by 1.

Rag Doll
As a Rag doll Your body gives you the following benefits 
You have resistance to bludgening and piercing damage but vulnerability to fire damage 
Your Charisma or Dexterety score increase by 1 

Wood Doll
As a Wood Doll your body gives you the following benefits 
You can use an action to heal yourself a number of hit points equal to your constitution modifier you can use this a number of times equal to your proficiency modifier 
Your Charisma or Wisdom score increase by 1