Build the antennae and the eyebrows, attaching them to the head ass soon as you can. Build from head to tail, closing the model on the tip of the tail. Glue the scales over it. 

IMPORTANT: the antennae are very small and fragile, and require extra careful handling. You will need pointed tweezers to glue them. I wouldn't recommend printing them on regular paper, but too heavy paper won't work either. I used 120gsm paper, which makes them foldable and yet firm after you glue them. Use the tabless portion of the antennae to close them. 

Glue the first two portions of the eyebrow, then glue the bottom 3 portions together, beginning from the tip. Join the two parts of the eyebrow and attach them to the head, after you glued the antennae to the head.

To build the scales, glue both pieces of a single scale together, closing it from the bottom to the tip, in a "circular" way, instead of gluing each piece vertically. Attach them to the tip of the tail with superglue.

Even though it's a snake-like pokémon, there are several small parts, including the end of the tail, which makes Milotic a Medium difficulty build.