public void UploadPhoto(string url, string accountName, byte[] image)
{
  using (SPSite site = new SPSite(url))
  {
    using (SPWeb web = site.OpenWeb())
    {
     ProfileImagePicker profileImagePicker = new ProfileImagePicker();
     InitializeProfileImagePicker(profileImagePicker, web);
     SPFolder subfolderForPictures = GetSubfolderForPictures(profileImagePicker);

     string fileNameWithoutExtension = GetFileNameFromAccountName(accountName);

     int largeThumbnailSize = 120;
     int mediumThumbnailSize = 90;
     int smallThumbnailSize = 30;

     using (MemoryStream stream = new MemoryStream(image))
     {
       using (Bitmap bitmap = new Bitmap(stream, true))
       {
        CreateThumbnail(bitmap, largeThumbnailSize, largeThumbnailSize, subfolderForPictures, fileNameWithoutExtension + "_LThumb.jpg");
        CreateThumbnail(bitmap, mediumThumbnailSize, mediumThumbnailSize, subfolderForPictures, fileNameWithoutExtension + "_MThumb.jpg");
        CreateThumbnail(bitmap, smallThumbnailSize, smallThumbnailSize, subfolderForPictures, fileNameWithoutExtension + "_SThumb.jpg");
       }
      }
     }
   }
  }

  string GetFileNameFromAccountName(string accountName)
  {
    string result = accountName;
    string charsToReplace = @"\/:*?""<>|";
    Array.ForEach(charsToReplace.ToCharArray(), charToReplace => result = result.Replace(charToReplace, '_'));
    return result;
  }

  void InitializeProfileImagePicker(ProfileImagePicker profileImagePicker, SPWeb web)
  {
    Type profileImagePickerType = typeof(ProfileImagePicker);

    FieldInfo fieldInfo = profileImagePickerType.GetField("m_objWeb", BindingFlags.NonPublic | BindingFlags.Instance);
    fieldInfo.SetValue(profileImagePicker, web);

    MethodInfo miLoadPictureLibraryInternal= profileImagePickerType.GetMethod("LoadPictureLibraryInternal", BindingFlags.NonPublic | BindingFlags.Instance);

    if (miLoadPictureLibraryInternal!= null)
    {
       miLoadPictureLibraryInternal.Invoke(profileImagePicker, new object[] { });
    }
   }

   SPFile CreateThumbnail(Bitmap original, int idealWidth, int idealHeight, SPFolder folder, string fileName)
   {
     SPFile file = null;
     Assembly userProfilesAssembly = typeof(UserProfile).Assembly;
     Type userProfilePhotosType = userProfilesAssembly.GetType("Microsoft.Office.Server.UserProfiles.UserProfilePhotos");

     MethodInfo miCreateThumbnail = userProfilePhotosType.GetMethod("CreateThumbnail", BindingFlags.NonPublic | BindingFlags.Static);

     if (miCreateThumbnail != null)
     {
        file = (SPFile)miCreateThumbnail.Invoke(null, new object[] { original, idealWidth, idealHeight, folder, fileName });
     }

     return file;
   }

   SPFolder GetSubfolderForPictures(ProfileImagePicker profileImagePicker)
   {
     SPFolder folder = null;
     Type profileImagePickerType = typeof(ProfileImagePicker);

     MethodInfo miGetSubfolderForPictures = profileImagePickerType.GetMethod("GetSubfolderForPictures", BindingFlags.NonPublic | BindingFlags.Instance);

     if (miGetSubfolderForPictures != null)
     {
        folder = (SPFolder)mi_GetSubfolderForPictures.Invoke(profileImagePicker, new object[] { });
     }

     return folder;
 }