Tiger attack on buffalo

Tiger attack on buffalo. this is the result of my painting which is similar to oil painting on canvas.

How can I do it?

easy way that is after finished making painting in app Sketchbook then I save and reopen in app Snapsheet. here I can choose the appropriate display format.

For example you can see in the screenshot image below

And then choose a speckled film format

For example :

So the results of his paintings look like on canvas

Thankyou esteem

Thankyou for all friends