One of the tips I read on here about taking photos of model cars was to get down on the models level. IOW, don't shoot all the pics from above the cars belt line. Take some pics outside too. Lots of light there except next Monday around 2:30 here in east Tennessee.
A good effort at a first one, Aiden. Nice detailing and good decal work. Clean build with no blemishes, finger prints or glue noticeable. I'm still working on perfecting some of those things myself. To make that model pop, you really need to work on the orange peel in the paint. Not saying you need to be able to put down a perfect paint job right away. I still can't. Learning to color sand the paint and use a polishing system will really improve the finish. Watch some Youtube videos or do a search here on the forum for color sanding and polishing paint. It's really easy when you learn. Here's a link on how to search the forum. http://www.modelcarsmag.com/forums/topic/74605-a-better-way-to-search-this-site/
Never mind the models, what do you want for the Roger De Coster poster! Got to see him race at Road Atlanta in the Trans AMA series twice. Won his second moto and the overall, with only a front brake. He is The Man.
Been there, done that. Yes, it is really hard to fill and hide those scratches, all the while trying to keep stuff out of the panel line. Here's what I found that works for me. http://www.radubstore.com/index.php?main_page=product_info&cPath=77_110&products_id=329
Dust has to be getting in some way. Where is the room? Basement or an area with carpet? Mine is in the basement and I have the ceiling and insulation covered with plastic. Do you change the HVAC filters often enough? If you're not sure about the air purifier, it may be another source of dust. To really figure out what the issues are, we'd need more information to get specific.