Oh I could do some effort and try to make my rivers tapered (just saw a tutorial on that here on the site), I didn't know how to do this at the time I made the map. Then they would be thinner at their origins. Otherwise, I do consider this base map finished for now (which is why I posted it here, I guess).

Well, if the difference is not significant, I'll just keep this one as it is for now. I do plan to make maps of the entire world at some point, but I think I'm going to have enough fun making up adventures, languages, cultures, countries etc. on this little continent for now, and of course more artistic or ancient-looking maps, which don't really care that much about projections.

I didn't realize the difference would be so little, so thank you for that very helpful comment saving me from putting a lot of effort into nothing!