HOW TO UPLOAD A PHOTO 
Are you trying to upload with a mobile device? 
http://m.mingle2.com/users/edit_photos 
Or from a pc? 
http://mingle2.com/user/edit_photos 

(Mingle2 does not support Windows-based phones.) 

File size: 
When it comes to uploading images to a Mingle2 account, the actual file 
size is almost unlimited. The number of pixels in the image, however, 
is limited to 10 million. In other words, the product of width*length 
must not exceed 10000000. 

Pictures should be in .gif, .jpg, or .bmp format. 

The picture has to be on your computer/device, not on a website. 

If this does not fix the problem, look in the help section 

http://mingle2.com/forum/forum/7 

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The same as you did when you uploaded yiur profile pic.

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This has been answered above!

Please read previous posts.