More information is available at the community portal. You may ask questions at the help desk, village pump or on IRC channel #wikimedia-commons (webchat). You can also contact an administrator on their talk page. If you have a specific copyright question, ask at the copyright village pump.
SVG (Scalable Vector Graphics)
Thank you for uploading some images! Did you know that the SVG format is often the best alternative for this type of image? Scalable Vector Graphics have a lot of advantages: They scale better, the file size is usually smaller then raster graphics, and they are easier to modify and translate, helping Wikimedia to distribute knowledge to all of the world. A lot of modern programs support SVG export, though the result is not always what you may expect. If you have questions, don't hesitate to ask me, a member of the Graphic Lab, or the Graphics village pump. Uploading images in SVG format isn't mandatory, but it would help. (Just to avoid any misunderstandings, please don't just put the raster image into a svg container as embedded raster.) Thanks, and happy editing!