Work in passes
Use a silhouette pass, a structure pass, a color pass, and a detail pass. During the silhouette pass, draw only the outside body and tail. During structure, add the eye, gill, and fins. This order prevents tiny details from locking you into a weak shape.
Finish each pass before moving on. If you notice a silhouette problem while adding spots, return to the outside edge first. Correcting the largest error gives more value than polishing a small feature.
Match brush size to the decision
Use a larger brush for the body and main color areas. A broad mark creates cleaner fills and encourages confident shapes. Use a medium brush for fins and pattern blocks, then a small brush only for the eye, mouth, and selected texture.
Do not outline everything with the smallest brush. Thin repeated corrections often produce a shaky contour. Redraw one longer segment or cover the uncertain edge with the body color, then try again.
Undo with a reason
Undo is useful when a mark changes the silhouette, hides the focal point, or breaks a planned pattern. Avoid undoing every uneven line. Small differences create character and help the drawing feel made rather than mechanically perfect.
Before undoing, name the problem: wrong angle, wrong size, wrong color, or wrong placement. That diagnosis gives the next mark a purpose. Repeating a stroke without changing the decision usually repeats the same error.
Protect clean edges
At the tail base, fin roots, and mouth, leave enough space to see where forms meet. Crowding several dark marks into one area creates a visual knot. Use the body color to reopen small gaps when needed.
Check corners created by fins and the tail. A tiny accidental gap can break the silhouette, while an oversized overlap can erase the body taper. Zooming in helps repair the join; zooming out confirms that the repair still reads naturally.
Review color and size before publishing
Look at the fish against both light and dark surrounding colors when possible. If an edge disappears, adjust value rather than adding a heavy outline everywhere. Keep the highest contrast around the eye or main pattern.
Finally, view the drawing at thumbnail size. Ask whether the direction, tail, eye, and main color pattern remain obvious. Remove any details that turn into noise. A community gallery rewards immediate readability before it rewards close inspection.