Slider images random , please help to set to "painting" as first image

Hi

I wonder if you could please help, please do not mention my website name in this chat so it doesn’t get indexed by google.

The link to the website is here http://goo.gl/YWISyO

At the moment the slider images are random, but my client would like the first image to be set on the "painting".

The image which needs to be first is the yellow painting in the slider. It is called "painting".

Could you please help.

I have installed code snippets, hopefully you can help with putting code in there.

Thanks
Joanne