By Christine Younan & Niamh Kirk If you’re feeling up for a challenge, why not see if you’re in the 2% of the population who can decipher the hidden images in this illustration? Optical illusions are a great way to get your eyes and mind working in different ways, and this one has left people scratching their heads over what they can see. In this rather unsetling illusion, there are four women to find, but many people are struggling to see it. The sketch was created by Ukranian artist Oleg Shupliak and shows a woman with long flowing hair – but can you see the other figures within it? At first…