Hi, i took a look at your listings and thought they were very good overall. Your pictures are well done. Your prices seem well-researched. So in terms of what might need tweaking, these are my thoughts.
The holiday season is upon us, and folks want their packages as quickly as possible. As you are in Canada, there could be some delay with international shipping, and you have a 3 day handling time. It gives the impression with the estimated delivery dates, that the buyer may have to wait much longer to receive their item, that could be delivered in 3-4 days if they buy domestically. So if possible, you might consider a shorter handling time, if it makes sense to your circumstances.
Your descriptions and Item Specifics could use bolstering. First, I would use a larger font, say a 14 point Verdana, for example, in your descriptions as they are too small right now and difficult to read (if you list with the Advanced or business listing form, rather than the Quick form in the app, you have more control over such details as font size). Next, describe in more detail and repeat the information from the title, condition field and Item Specifics. It may seem redundant, but many do not read the IS and the more details, the better understanding a buyer has of the item. (You are currently not in danger of over-describing.) Things such as brand, size, material, color, measurements, purpose of the item, age or era, any flaws, condition, etc. need to be included. The Item Specifics are particularly important as they inform the Search engines. Inclusion on Google, Bing, and the like is very useful to direct traffic to your listings. In addition, eBay's own search engine uses IS and that informs it of your placement in buyer's search results as well.
You mention in some of your listings that should a buyer have a concern, that they should contact you to resolve any issues. I fall in the camp that believes it is a negative to say this a customer, because it infers you anticipate a problem with your transaction. Why suggest to a prospective or existing buyer that you expect any issue or concern? Of course a buyer will contact you if a concern arises, but no need to suggest you anticipate anything but a happy result. It's just Shopper Psychology 101.
You mention having a return policy, and I see you have added it to your listings. I agree it is very important to have a buyer-friendly return policy to express your confidence in your items and listings, especially for new sellers.
Lastly, below is a link to eBay's suggestions for SEO that may be helpful as you grow your eBay business. Wish you much success and please come to the forums anytime you have a question.
https://pages.ebay.com/seller-center/listing-and-marketing/boost-traffic-with-seo.html
