Did I construct the following sentences correctly? Please advise

1
  • The leaves haves various shades of fall foliage colors.
  • The picture shows the various shades of each of the colors.
  • Thank you so much for your thought about/of including me in your holiday plan.
  • Thank you so much for your thought to include me in your plan.
  • Sorry about the long delivery time.
  • Fresh seafood usually have the freshness flavor. (Can I say flavor?).

Did I construct the above sentences correctly?

I am trying to improve my English by constructing random sentences that come up to my mind.

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2
  • The leaves haves various shades of fall foliage colors. (Here the verb should be have)
  • Fresh seafood usually have the freshness flavor. (Can I say flavor?). (Here the verb should be has, and you can use ‘flavour’)
    Other sentences, to me, sound acceptable.
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