One really great way to start is to have a 3D reference like Daz next to your working screen. As well as humans Daz has animals that are anatomically correct which you can use while you work. The second thing is to start low and as you work slowly increase the resolution of your mesh. There are a lot of youtube vids…
First off: reference is key! Find as much as you can, and make sure you keep in mind that different focal lengths drastically alter how something appears, so you can't just use them as blueprint.Secondly, start with placing primitives, and keep any 'sculpting' minimal, mostly using the move and snakehook tools to warp…