It might be art, but in this case it’s a photo of a sunflower that just opened up today. I used the crosshatch filter in Photoshop adjusting the stroke length, sharpness and strength.
There are dozens of filters to choose from, each with several different options and you can add other effects in literally thousands of different ways, maybe even hundreds of thousands.
People say that you can learn Photoshop in 50-100 hours, but it really takes years to get anywhere close to mastering it. It would probably be faster to learn to paint with oil on canvas, but it would definitely not be easier.