Draw a simple oval shape for the body
Add a triangle shape at one end for the tail
Draw a small circle for the eye
Add a curved line for the mouth
Draw a fin on top of the body
Draw another fin on the bottom
Add a small side fin near the middle
Draw a line inside the body for detail
Add simple scales if you want
Trace over the lines to make the fish clear
Erase extra sketch lines
Color the fish with your favorite colors