So what you can do is go to your profile, click "Add Widget" and then one the menu pops up, click "Custom Post". This will allow you to upload your screenshots, or anything else for that matter.
Honestly you just have to pay once to get Java, and you have everything you paid for available to you at no expense, Including servers, skins and username changes.
On the other hand in Bedrock Edition you have to pay to get skin packs, username changes and everything else has some sort of purchase available ie: minecoins.