Hi Sometimesme and welcome to the forum - Glad u found us!
Your pics are way way cute. I made your pics a bit smaller, rotated them and sharpened them a bit.
Normally images straight from the camera are way too large to be uploaded directly. They will show, but the will stretch out the borders and will always upload in horizontal format. This will happen on any site on the Internet.
Personally if my images are vertical (portrait) in orientation I'll resize them to about 500 pixels wide. If horizontal, 800-1000 pixels wide is nice.
You will need a graphics program to manipulate (rotate, resize, sharpen etc) the files and 2 free good ones are;
(easier - a few members on our board use it)
(much more robust and can act like Photoshop in many ways)
If you need additional help - don't be shy to PM (private message me).