>>2418352
learn perspective and learn to understand form

Practice.

In particular, try drawing just references in other perspectives. If you are decent at 3/4, then try and translate that info to the other directions. Just moving from one angle to another doesn't move the actual placement of the features, just the direction of it. The nose is always at the same point, the eyes, ears, etc. The only difference is where the points are at.
If your issue is the face, try focusing on a certain point, preferably the nose as that's the center of the face usually. If you know your proportions, then moving the eyes and mouth in should be easy.

Look at Loomis for more help on that. Also look into perspective books too.

Not op here, just starting out