One thing that could be improved when doing retopology in Blender, is the way backface culling works: Only the faces are hidden, but edges and vertices on the other side of your mesh are still displayed. This can get quite confusing after a while. Luckily, there’s an add-on that solves this problem. It’s very easy to use: basically you just install it, and enable it. Then there are some values you can tweak to your personal preference. It’s called Draw X-ray and it has a free version that, in my opinion, is more then enough. But if you like it and use it a lot, please consider giving the author a few bucks on Gumroad. You can find it here: https://bartoszstyperek.gumroad.com/l/draw_xray