thanks man
-by focal length i mean the millimeter of your lens. i usually shoot with my sigma 10-20mm lens, but also shoot with my 50mm and kit. just gives you a different sort of perspective and angle. I don't shoot everything on my sigma, even though the colors on my sigma look better. anyway..
-by colors, there is just a vibrance on your clouds and blues just seemed, almost too vibrant, like you cranked it up a little too much. sometimes when you want to something saturated, for example, you crank the saturation up but it creates an unrealistic color. just a thought, not really criticizing.
-the speed is always subjective. its really what you feel your environment looks best as. if its an even speed then thats okay, i have no problem with that. The one thing i will still stand by is the length of the lapse. for a sunset or a partly cloudy day i will go for no less than an hour lapse, and for as long as two. stars i do no less than two hours. just a suggestion.
still liked yours nonetheless, just some constructive suggestions according to my experiences