I agree with everybody here. When I upload a picture I always reduce the size of the image and it has to be a jpeg format.we will be witing for your pictures,**
I found it usually would not upload if the "size" memory wise is too big. Take up the offer to resize. That usually works
If you need help cropping or getting your photo made smaller, pm to me and I'll help you do that.
Here is the link to a tutorial on uploading pictures. Not sure which section you are trying to upload in, but this is a pretty standard answer for all areas. I suspect that you have too many pixels and must reduce the size in your photoshop or whatever program you use for digital photos.