Lots of references help for sure. I'd maybe look up specific references as you need them. When I first started my webcomic, drawing horses and backgrounds was definitely my weakness. I made a conscious effort to include more of what I was bad at, so that I would practice. I would often spend more time on the background than the characters. I'd try to pressure myself to not take short cuts and really work on those things. It took me almost 80 pages to really get the hang of drawing backgrounds and horses too.
This was a helpful tutorial for me though: