To insert image in PPT using TCL/Tk

i want to insert some images captures by HM, stored at some location which need to pull them and insert in PPT with some comments.

in my script i am able invoke power point but do not know how to insert the image.

exec {C:\Program Files (x86)\Microsoft Office\root\Office16\POWERPNT.EXE}   

i am very new to scripting