It doesn't look like the video card gets any fresh air.
no direct air flow. no front [of case] intake fans and
no fans on top of you case pulling heat out of your system.
I don't think your case has good air flow. you can modify it
by adding a side fan(s) [in the removable door of the case]
or add a pci slot cooler.
It seems like you have a pre-build system. You could swap everything into
a nice mid tower when they go on sale. Microcenter has Thermaltake V3 Mid Tower
or MSI Tactical on sale $19.99 after $15 rebate. if you don't have a local MC, Newegg
has the NZXT Source 210 on sale sometimes for ~$25 after rebate.
But your temps are fine. No need to rush out and buy anything right away. if you start
going above 85c I would be worried. Keep an eye on your temps and if you want to
get a mid tower case some time it will help.
How to decide on a case for air cooling by ehume
Guide to Proper Case Airflow Design
How To: Properly Plan And Pick Parts For An Air-Cooled PC, Part 1
Airflow: Ventilate Graphics Cards Well