I think that is washed away from increase in the size from the initial. I would advise to you to work with the original, instead of me the processed pictures. It is assured, then quality to improve. It will be good, if you surpass my works
After your comment, I've compared the ones where you originally put up the image - and in comparison - my images seem better to me than yours.
Since they all seem bad on your monitor, (and yours all seem lower quality on my monitor) it may be as simple as our monitor settings being set at different levels.
Can someone else give me some input on how image quality appears to you?
Goggog, they're mostly pretty good on my monitor. (A few are set a little too bright). Is it possible your monitor settings are darker or brighter than mine?