It's hard for me to do this without seeming like I'm picking on you, but, as I said, pages only need multiple pictures if they are large enough to warrant them. Pages like Spider-Man's, for example, would warrant a gallery. Pages like The Spot's do not. Also, in the latter case, one of the images was not of the right character. You may not be aware of this, but we treat characters from cartoons, movies, and the comics as different characters. The page you edited was the one for the comic Spot, and you added one of the cartoon Spot.
Also, don't put the gallery in the center of the page. Put them at the bottom. It improves the page's look. Thank you.
Hey! I'm a fellow member of the staff, and if you want to try some stuff out, feel free to check out our Sandbox. You can make all kinds of edits there, and it won't hurt anything. You'll learn over time. I've been on wikia for around 5 years, and I'm still learning little tricks. My best advice to you about the page situation, is don't make a page that you don't have any plans for. A blank page looks pretty unprofessional, and isn't ideal. So before you make a page, make sure you have a fair amount of info to add to it. It's alright if it isn't perfect at first, just continue to work on it. So good luck, and Happy Editing!