I think you're uploading small thumbnails, which makes it hard to see them...
Upload the regular sized pics, as long as their under 250k in size, they'll be fine ...
Here's a web based re-sizer, if you haven't already got Microsoft's Re-sizer program that's free and integrates right into Windows ...
Free Online Picture Resizer - Crop and Resize photos, images, or pictures online for FREE!
Regards,
Badger