Could I have your impression of my performance today?

可以说说我今天的表现如何吗?

Could I have your impression of my performance today? 

可以说说我今天的表现如何吗?

To be frank, you should practice more. 

说实话，你需要多练习。

Is there any room for my development? 

我还有什么发展的空间吗?

Is there any room for my development? 

我还有什么发展的空间吗?

Yes, I believe there will be a lot more to come from you.

是的，我认为你有很大的潜力。