This is a fine and educative write up. I will later come back and give my thoughts in detail. Meanwhile i recommend you edit your tags and include either or both 'science' and steemstem'...they curate such articles, and if this is good, which i think it is from the perusal i just did, then it will easily get rewarded.

However make sure your images are not copyrighted...in deed, even if they are free, it is advisable you indicate those 'free sources'......to increase your chance of being rewarded.

Cheers!