I think you took a nice concept, and the idea is also clear in the drawing 
It did not give me afeeling of creepiness though… I think that is because the figure looks a bit creepy but not enough to make her stand out as something threatening in the otherwise sunny and beautiful forest. She’s standing there and looks at you, but it’s not clear to me why she should be a threat, why you should be a bit scared. I would wonder what she was doing there in the forest but not feel scared. So the drawing more gave a sense of wondering.
But that might just be me. I think the situation you drawed is really good because everyone knows this situation that there is someone standing at a place where you dont expect them. So even though it did not transfer a creepy feeling on me, i still like it 