Need small 3ds max problem fixed :-D

[the1greg]

hey, i was bored and decided to make a 3d model out of a quick sketch to brush up on my very rubbish max skills. I photoshopped it a bit and drew some topoligy lines but the picture came out very low res in the viewport when i stuck it on a plane to use as a reference aid, and hard to see where the lines were exactly; however the picture was fine when rendered.
i was just wondering if there is any solution to this minor problem, i looked around at some of the preferences and customisation options ect but didnt see any options to change it.
NOTE: the image is a very high res from when i scanned it (5k x 3k px) but i have also tried scaling it down and it makes no difference.
cheers for your help in my 3ds max noobishness

[img]images_dark/imagebig.gif[/img]

[the1greg]

every time i edit and delete the extra pictures it makes a new one :S