1,I'm good at drawing and many of my drawings have won prizes
有语法错误 改为：
I'm good at drawing and I have won prizes for many of my drawings/pictures.
2,I hope you can like me
And I can become you friend soon
can去掉,like改为其他词如：
I hope you will be happy to meet me ,and we will become friends soon.
3,My favorite colour is sapphire blue.放在I like singing and drawing 前.
Hope you will be nice in your new school!Come on!