I don't like the added lens flare. Looks cheesy to anyone who's seen it in photoshop before.
Yes, it's unnatural, but the 2 images posted have both been edited with a degree of tone mapping. There's little data left in the JPEGs to extract anything out of. I've mentioned that I wasn't entirely happy with the image - the flare being an issue, the other the lack of detail that one can extract, but consider the image without ithe flare - there was little else to have been done to pull any detail from the bike rider. There's nothing left in the JPEG for filling.
Therefore simply merging #1 & 2 isn't possible with the 2 images shown. Given originals, perhaps, but tone mapping has made it impossible in the JPEG format.