These storms were relatively inactive so once again it was hard to compose. Probably they could have been zoomed in a bit (well you couldn't drive closer in this case) and exposed for a bit longer.
These storms occurred at Andamooka. They occurred in late afternoon light and so were more difficult to capture due to the shorter exposure times. There is a lot of wasted photo at the top so zooming in and cropping the picture more tightly is necessary. Also, just to get rid of unwanted elements one could have moved closer to the storm, say, just past those houses which are about 800m away (versus about 3km for the storm).