It hasn't worsened JP, I use it quite often. It's just the file type that you are using that will be having smaller limitations, and maybe there's more detail in the pic in this case.
I find .jpg to be the best.
We were told in the past that these things can't be adjusted on this forum.
You're welcome to email me the pic, I've got software that will do all needed adjustments / conversions so would do so and email it back.
Or try it yourself if you want: www.irfanview.com
I'm sure you know, but for others - file sizes can be seen by clicking on "manage attachments" when making a post, scroll down in the new window that opens.