You may use official images on the Wiki.
Please make sure to check for images before uploading them because we may already have the image you want to use (and we do not like having duplicated images on the Wiki). We have a Photos page that lists some photos that often get duplicated (note: this is a work in progress and not all photos might be there).
Also, some images might have their Super Sentai name, instead of their Power Rangers name. You can use RangerWiki for help with Sentai names, if you're not familiar with them (you can also ask us, if you're not sure).
When it comes to fan made stuff that you did not make yourself (such as fan made artwork, logos, edits - anything that is made by fans, like from DeviantArt, Pixiv etc - anything else that isn't official) - you must ask for permission from the original artist before using it on the Wiki (a lot of artists do not like having their artwork used without permission). Please have a read of our image rules.
In short - you may use official images on the Wiki, but you must ask for permission to use fan made stuff. Hope this helps.