You can disable the animation from the theme options by checking the option in the General tab of options panel as shown below –
https://docs.google.com/file/d/0B9j6FQo4cSQFcXBMZE1xTUVYQkU/edit?usp=drivesdk
You can then follow some of the help provided in the below post to change the screenshot to one of your own. Let me know if you need further help. Thanks –
https://www.livemeshthemes.com/support/forums/topic/showcase-section/#post-2173