I have a python script and want to know, how do I 

1. add IDATM labels to the atoms

2. add a label in the upper right/left corner

3. make image nicer

4. save image as png

I use the command 

"from chimera import runCommand as rc"

and then "rc(COMMAND)"

What should COMMAND be for my questions 1. - 4.?

Thanks in advance,

wpron