Who can tell me if a drawing (pencil sketch) is the real thing - it is from the 'Winnie the Pooh' ...series!?

My 1st. time on this site and spotted the very question I also wanted to ask - I have literally looked at 100's of pencil drawings and feel it is genuine I have taken it to 'experts' who think it IS but want to send it off for further advice but I'm reluctant to let it out of my possession...