I think you are doing this a very complicated and unreliable way. It still isn't clear which exposure process you are using as the pictures seem to show a very low resolution track layout. Are you using a transparency as shown in the article or paint/ink covering the copper directly?
Using sunlight to expose the board isn't a good idea, you want a light source with higher UV content and a shorter exposure time. Light scattering under the edges of the ink on the transparency will cause poorly defined edges and unless the black ink/toner areas are very dark, some light will still pass though. There is no substitute for a good UV source with a glass top so you can sandwich the transparency and board under pressure to eliminate any gaps. Regardless of that, after exposure and removing the photo-resist you should see a very clearly defined track layout with shiny copper showing where it is to be removed and a good layer of resist where the tracks will be.
The vinegar/hydrogen peroxide solution you are using the etch the board will be very poor and unpredictable. Get hold of some Ferric Chloride or a proprietary PCB etchant. Shop vinegar and hydrogen peroxide will not have controlled concentration. If you have to leave it for a long time in the solution, the copper will be eaten away under the edges of the resist.
Reasonable times for exposure are around 3 - 4 minutes and for etching about 15 minutes.
Brian.