Ever since I started working on silhouette images I was looking for an opportunity to produce a bird in flight silhouette. Slow moving vultures and clean background at eye level produce an excellent opportunity. This image is a pano stitching of 4 images. Vultures flew multiple times and I made 3 attempts. Here is the best one. if 1 and 3rd pose had little head separation it would have been little better.
You have already mentioned the heads on 1 and 3. Other than that this is a terrific concept. The left wing on #1 is a tad too close to the body, but forgivable. The bright sun is blown by most standards, but since I do not use filters, most of mine are considered blown too. :) So I think it is normal. LOL :) I like it Sid. Thanks for your posting this. Excellent colors.