This is well written. Please see my suggestions below. Keep up the good work!

The most important person in my life

I'm not really original. The most important person in my life is my son. He's two and a half years old and he's wonderful. I love him very much, he's my pride and my happiness. He has blue eyes, blond curly hair and a small nose. He's   really funny and it's always great to spend time with him. He likes   molding very much and we often mold funny animals and figures. He also likes to draw and the walls of our flat are decorated with his drawings. And he's cheerful and bright. He always open to new people or children and new ideas too. No matter what we're doing, he always active and funny. I really like   spending time with him and he makes me feel cheerful too.

The most important person in my life

I'm not really original. The most important person in my life is my son. He's two and a half years old and he's wonderful. I love him very much. He's my pride and joy *my happy. He has blue eyes, blond curly hair and a small nose. He's a really fun and it's always great to spend time with him. He likes very much molding modelling very much and we often mold mould funny animals and figures. He also likes to draw and the walls of our flat are decorated with his drawings. And he's cheerful and bright. He is always open to new people or children and new ideas too. No matter what we're doing, he is always active and funny. I really like to spending time with him and he makes me fell feel cheerful too.

* "pride and joy" is a set expression.

He sounds fantastic. I love the enthusiasm kids his age generally show towards everything.

He is fun.... means he is enthusiastic and a pleasure to be with.

He is funny..means he makes you laugh.

I get the impression both are true in this case!

I’ good job writing this! I’ve made a few corrections, so feel free to read through them. Overall, you did a great job! m not really original. The most important person in my life is my son. He’s two and a half years old and he's wonderful. I love him very much; he's my pride and my joy. He has blue eyes, blond curly hair and a small nose. He's really fun and it is always great to spend time with him. He likes molding very much and we often mold funny animals and figures. He also likes to draw and the walls of our flat are decorated with his drawings. He's cheerful and bright. He alwaysis open to new people or children and new ideas, too. No matter what we're doing, he is always active and funny. I rially like to spend time with him and he makes me feel cheerful, too.