Thank you, to everyone who commented. I appreciate you taking the time to consider these three stamps and posting your opinions.
I understand there are many variables that affect perception, regarding true color, as well as clarity. As KGB pointed out, it is difficult, unless you are holding the stamp in your hand. Monitor settings, a person's visual acuity, a person's ability to scan at high resolution to get the best image, even the scanner used, itself, all contribute to how well a stamp looks online.
From the comments posted, if I am reading them correctly, I now, also understand that I need to look at perf condition, clarity and boldness of color, signs of fading due to age and it's overall condition that may present how well it's stood the test of time, as some of the things to look for.
The difficulty, I am finding, as a novice, is to discern exactly what is a fair trade, or would be a good trade up, from what I have, if I were to either trade my stamp, or purchase one I do not have.
Per advice given to us newbs, when trying to learn what that trade or value is, I have a Scott Catalog. I have EZ Stamp. I have looked at the
ebay sales, and I have looked at sales from various auction houses. I don't know about anyone else, new to ohilately, but the prices I am seeing are all over the place, for a used 219D. I've seen them go anywhere from $2 to over $100. I started this thread, to see if I can learn more about how to assess what I am seeing.
To answer questions some might have, the first stamp, in the OP, is mine. I have no value assigned to it. Off the top of my head, going solely on what I have seen said in the community, in regards to 'low value', lack of desirability, and it's commonness, I'd place it, in my inventory program, at about .35 cents. Based on the centering I am seeing, perhaps it might be the $2.35 my inventory supplies. Or is it the $5.50 Scott says? Or is it the better centering and $5.88 the inventory suggests?
The second stamp is from an auction house. It is the one with the certificate. It was sold as part of a set that saw $200. (The other was a 220, and had a star cancel) Only the Lake stamp image was shown. I may be wrong but I suspect it was the one carrying the sale of the two, since the other stamp image was not posted. I have some really nice 220's. If I were to pair one of them with the Lake I posted, as jim says he does, without certificate, I'd probably place the value at about $4 for the set.
Then, there's the third stamp. It is an
ebay BIN for $15. I saw others going for over $20. Then, there's the one that sold for $75.
Now, I know the 219D Lake, no matter how good it's condition, is not going to net me tuition for my child's college. I suspect this is why many are saying it has a low value.
Then, again, I dunno, maybe I might have one like this, a result from a simple web search. (I didn't post the external link, since I am still fairly new, and I don't want to cause conflict in revenue links with those in the community, per the listed rules, so I posted the pertinent info, from the page)

Seller may know his way around stamps, better than a scanner. That is why I asked about image comparison and consider the fact of color and clarity aren't always going to transfer properly to a monitor. The stamp in the image above, looks to me to be a 220.
I wonder is this stamp really rare and worth that amount? Is this the type of guy exactly why I'm asking these questions so I know to avoid those like that? According to what he says on his home page, he is what I mentioned in my paragraph above in this post, someone who knows stamps, but not scanners. You would think, however, for the price being asked, the image would come out as well as the one for the auction house that sold the set for $200.
I might be overthinking this, on a low value stamp, but I need a baseline of factors I need to learn to consider, when determining what is a fair value, for trade, or purchase. You guys don't want me to come back here, every time I run across a decent looking stamp and ask what do you think, or how much, anymore than I want to. I have four volumes of classics alone.
Some might see that I'm also asking more than one question, or perhaps KGB can come back, and simplfy what might be my true question, I'm unable to get to, down to Sesame Street level. I do tend to 'go around my elbow to get to my nose'.

Thanks for reading thus far, and for any following comments, or suggestions. I look forward to learning more.