From postimg, you need to click the 'share' icon and copy the 'hotlink for forums' link, into the message body;

If you post up pics of the car in general, with more pics of any particular bits you've mentioned, that will help no end I imagine.
If you just start posting pics of individual parts, you should be listing them in the parts for sale section and will need to comply with the relevant forum rules for that section (include a bit of paper with your username written on it, visible in the pic of the part).