我正在画画用英文怎么表达？

Please don't knock the table while I'm drawing.

我画画时请别敲桌子。

I'm drawing a picture of my mother.

我在画我妈妈。

When I'm drawing, if I make one mistake, I have to start over.

我画画的'时候如何出了一点差错我都会重新画。

Yes, please. I'm drawing a flower bud.

是的，请给我一些。我在画一朵花蕾。

So, I'm drawing more and more levels and they never quite look the same.

画了更多等值面，它们看上去不太一样。