What a fun image! The colour palette and composition draw me in to this piece, along with the sense of story and adventure. Was it photoshop, painter, acrylic, oil, or something else?
You've created a good texture for a speedpaint. One thing I would suggest is to be careful matching the grass colour to the area - here, the grass looks like it's shadowed, because the colour lacks the brightness that the the rest of the pic dictates for it.
I really like art like this.