Learn English – What types of sounds do cars make

Although dinky is defined as "small; insignificant", as a North American speaker, I would think of a small, full-sized vehicle, like a VW Beetle or a Mini Cooper. A Matchbox car would be recognizable, though collectors might find it too specific if you're referring to die-cast toy cars, in general.

Edit: Some people may take issue with the use of a trademark as a generic term (which I would liken to frisbee), and although the company has its roots in the UK, it may not be well-known there. If you are wanting to avoid the word "toy", then perhaps simply die-cast car would work.

As parallels for your 'flavour' and 'timbre,'

for touch tactile adj., tactility n. Critics describe a sculpture that visitors want to stroke as 'tactile.' for smell aromatic adj., aroma n. but 'Quelle est cette odour agréable,...?' in Wiki is translated fragrance.

I think sight is too complicated. The picturesque movement now seems dated. Pictorial is lame. Effulgence is a bit OTT, bright and making an impact, it covers colour and brightness but not form or interest.