Hi, sorry but you're not allowed to upload artwork that you didn't make here. This site is for your own art; it's not an image-sharing website. I suggest you remove the pictures that don't belong to you.
If you like art, you can build up a collection by adding other people's artwork from this site to your favourites. That way the original artists get the attention they deserve and no one thinks you're claiming the artwork as yours
FAQ #8: What are violations of the deviantART copyright policy?