Hello Jim, welcome to Wikipedia. I hope you enjoy editing here and being a Wikipedian. You can learn more on the how to edit page. The naming conventions and style guide pages are also useful. There is a sandbox which you can use to experiment in. If you have any questions, see the help pages or add a question to the village pump. Angela 19:49, 29 Jul 2003 (UTC)
House dust mite
Congrats on the article which I see you are the main contributor on. Just wanted you to know I have reverted the image used in the article to the first one you uploaded. I guessed that the second image was added so that it was a better size for the article. Wikipedia policy is instead to keep the large image and instead use resizing markup to dynamically resize the image. This is covered in Wikipedia:Image use policy Rule of thumb 5.
However, it also occurs to me that maybe you optimised the second smaller image (contrast, sharpness) as well. If that's the case it would still be better to do that to the full sized image and keep using the dynamic resizing.
One other thing - there is no image copyright tag on that image. That's a very important detail. Where did you get the image from and what is its copyright status?