Secret Doll Ming Meng Mong Questions

Recently fell in love with Secretdoll Ming and Mong after seeing some cute pictures of them on pinterest. After checking Secretdoll website, I found that there are many volumes of Ming, Mong and Meng.

Some differences are obvious such as smiles and narrow eyes, regular jointed and long bodies. Are there other differences on the volumes I should be aware of when choosing? Its not specified on the website and I cannot tell from pictures alone.

Does anyone own mini version? Can I see comparison photos? Any photos of bodies and heads and eye openings will be helpful. Eye sizes are also welcome.