Hi Caitlin! I actually really like this! Great job on your first try. I really don’t have much experience with HDR, so I’ll just ‘critique’ the photo itself. One of the first things my eyes were drawn to were the blades of grass in the foreground. You could remove those pretty easily in Lightroom, so I would suggest that. Also, the horizon is ever so slightly off balance.
In my opinion, I don’t think it looks unrealistic, but if you really don’t like it, you could just slightly reduce the saturation in the photo. Also, great job for not having a tripod!