Started this a while ago, finally got round to finishing it. Not too happy with the background though; I wanted to use a photo of foliage with effects/filters applied but I couldn't get it right, so I ended up using brushes instead. Left the sketch lines in on purpose; after toggling the layer on-off, I felt it gave a certain feel to it which I liked. I used a stock photo to reference (@syaccas_stock on dA) the pose and a google image search to reference the clothes.
Done in MyPaint and GIMP