Upload & Sell: Off
As an aside… I read some of the other replies and many bring up the idea that you are at a "low res". I would remind everyone that when I started using Digital, this was the "normal" size of a file. 1.2mp was the starting point as I recall.
When Canon came along with the D30 at 3mp!, everyone said things like finally, the ultimate resolution… how could anyone want more than this?
Haha, and now here we are asking if we can get away with our images at 1920px for an A4.
You will probably be totally fine.