I'll agree with pretty much everyone here that your plein air work is great - stunning work there.
Unfortunately, your sci-fi fantasy images aren't up to that same level. Your characters are very stiff and lifeless and most with anatomical issues while your design elements such as the mech and the dragons are a little boring and uninspired. The environments in those paintings doesn't compare to your other work either until the last couple of images.
Good amount of work though and no one can fault you for at least trying to challenge yourself with something different.