Is that a smile? Perfect image for spring. A little more saturation in the sky would be nice, but I imagine that's about the shade it actually was. I'm not sure a square crop really works here, but the diagonal is great. Nice work.
I just love the expression on this little guy's face. The lighting seems a bit harsh. Too bad there couldn't have been a few clouds in the sky when you took this picture.
Great use of negative space, and I love the angle of this photo. I feel like Heidi climbing the hills looking at this. I definitely would have minimized the white border, it distracts from the colour in the picture and enhances the white (blank) space of the lambs head. Overall great job.