Digital camera to n-gege via usb??

I think you have the "old" N-Gage. You have to do following:

Connect DC to PC
store your photos on your pc
Connect USB-Cable to PC
Connect USB-Cable to N-gage
go to "my computer"
there should be the mmc of your phone under "changeable drives" (right?)
You open it and search for an folder called "Images"
copy your photos into this folder :icon14:

if you want to copy yor images directly from DC to n-gage, that would be impossible. Your Phone hasn't got the Software and protocols for it 😉

I just about directly😞

USB is designed so that a device is either a slave or host/master and the host is in control. A PC is a host. A mobile phone with USB support and also digital cameras are generally all slaves, and can't be connected directly to each other.

There is a newer USB standard called USB OTG (On-The-Go) that enables this, but I don't know any phones or cameras with USB OTG support yet. Two USB OTG devices can be connected to each other.

If you have a digital camera that has SD card support, it will also accept MMC cards. If you take the pictures onto an MMC card, you can put it in your phone to get at the pictures.

Other than that, a digital camera that'd support OBEX (OBject EXchange protocol) file transfer over Bluetooth would work, too. E.g., Concord, at least, used to make one.

There are also a couple of Bluetooth cameras with Bluetooth Basic Imaging Profile (BIP) support, but the N-Gage doesn't have BIP (like some newer phone models do).

Besides that, you neeed a PC, as described.