|I had the same problems some month ago, when I sent my first pictures on TL and TN. You can reduce size of pictures without getting it too small. I explain you how I do : I am using Photoshop to reduce my pictures. At first I reduce the length of the picture to 800 pixels, by clicking on "Image" and then on "Size of the image". Then I use the "Save for the Web" option to reduce its weight to 200 kilobytes. I don't know what software you are using, but if you have Photoshop you can try it like I explained.
I hope this will help !