Hello. The examiner who checks your drawings might look for the following things:

• Your understanding of perspective, 2D/3D drawing, light and shadow understanding.
• Your creativity, imagination and thinking power- How you can draw a particular thing with a different concept apart from the usual/traditional, your vision.

Also note that it is not necessary that if you draw well your NATA Drawing score will be high. The above mentioned points are very important for a to-be architect so the examiner also checks if you are capable for it.

I would recommend that you practice previous years NATA papers and along with that you can type nata drawings in google and you will find many drawings/sketches there. You can take inspiration from there.

Below link may help you prepare better for NATA 2019.

https://engineering.careers360.com/articles/how-prepare-for-nata-in-6-months

Hope this helps. For further queries feel free to comment down below.

Good Luck!