Clouds look not very realistic. I think the original ones were less eye catchy and thus less artificial and naive art styled.
Really???
Beauty, as they say, is in the eye of the beholder, I guess!!! For my tired old eyes, I think they look great and are much more realistic than stock. But to each their own!
The one observation I might make is that cirrus clouds, being much higher than cumulous, should not appear to move faster. I presume this video footage may be a time lapse thing rather than real-time relative movement, so excuse me if I have spoken out of turn. Keep doing what you're doing so well, guys.