eet smakelijk 
The hotdog and burger are too dark for my liking. Also the quarter eaten doughnut needs bite marks. But apart from that good work.
I wrote a tutorial on how to create a glazed doughnut in Blender here: http://www.benamend.com/2011/01/28/how-to-create-a-glazed-doughnut-in-blender-2-5/
I know yours is a different kind, but it might help a little.
I agree with Chuk_Chuk the half eaten donut needs bite marks but every thing else is good. Nice job! 6 and a half out of 10!
I really like all of these as is. Very clean and simplistic. Not photoreal, but it works. I’d maybe look into the distribution pattern of the sprinkles and the sesame seeds, other than that, well done.
hmmm… one thing which would really improve it would be adding a texture to the inside of the doughnut…
i agree with Highlander_93. the hot-dog and burger can also do with some texture.
thank you all for the tips and comments it helps allot to make it better.
@SSimpossible: great tut. i did the donut whitout a tutorial but your tutorial is great (also your website :P).
IT looooks THIRD DIMENSIONALLY DELICIOUS :yes:!!!
Textures would be cool though