Really lovely work Petar. Unicorns were my favourite mythical creature growing up - I would buy anything with a unicorn on it when I was 8... I think I still would ;)
Nice work.The girl in the first image looks like she couldn't possibly hurt anyone, so that's probably the reason they rejected her. The one that replaced her looks stronger and more determined, so she seems to be a better choice. But both paintings are beautifully done.