need pinhole advice

I uploaded 2 photos to the gallery: traci_bunkers_2_1 & traci_bunkers_1
Near the upper right I get an area that is lighter than the rest of the
pictures. What causes this and how can I fix it?

I took this with a Holga that I modified to be a pinhole with approx F/230.
This was shot on Kodak 160VC. The exposures were approx 4 secs.

Also, in some of my shots (not these), in the bottom right corner I get a
diagonal line that is curved and varies in thickness/shape. Is this a
reflection off of something in the camera? I sprayed the inside with a flat
black paint and "sharpied" the shutter. I haven't noticed this "thing" when
I shoot with black & white film.

Thanks for any advice!

-- 
Traci Bunkers
Bonkers Handmade Originals
http://www.bonkersfiber.com