As a registered user, you are allowed to upload 1,000 Kb (1 Mb), Gold Members can upload 10,000 Kb (10Mb).
Your files are larger than 1 MB. There is no reason your image should be bigger than a hundred Kb. You need to edit your pictures, and save them with a little compression (I suggest about 20%), and a smaller file size (no bigger than 1200 x1200 pixels), and no more than 100 dpi. We don't need or want 8 Mega Pixel images, it just wastes our hard drive space. Your images are 30,000 Kb, when it should be more like 80 Kb.
Edit the pictures, compress the pictures, make the pictures smaller.
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I just trippled everyone's upload limit