i did as you said to see the images full size, but with my screen resolution (1920 x1200), one image came to about 5 x 7 in.; the others i tried were a bit smaller, like 4 x 4 or 4 x 6 or so.
if you just want to show your images, then i agree it is sufficient, but if you want them to be appreciated like they should, then when you load your recent works, you should make them available in much larger sizes.
also, if you want to make them available in large sizes, then you should devise some sort of semi transparent watermark that would partly cover important parts of the image in a way that the watermark would be difficult
to remove without hurting the quality of the image. this though could be done only for larger sizes; that is, except if you don't mind risking that someone will copy them and sell them to some magazines or as prints to the public...
Personally, i don't put watermarks on my images, and i don't give a damn if someone does it; maybe because i don't have a style that others envy.