Most corporate interfaces treat illustrations as decoration. They get added late, in whatever style the designer had time for, and they end up explaining nothing. An illustration earns its space when a user looks at it and understands the screen faster than they would from the copy alone. If it cannot do that, it is costing load time and attention for no return.
Illustrations work best where text struggles. An empty dashboard is the clearest case: instead of a grey line saying no records found, show a simple drawing and one sentence telling the user what to do next. Error screens are the second case, where a calm image lowers the temperature of a message without hiding the problem. The third is orientation in long flows, such as a four-step setup, where a small drawing per step shows progress without another paragraph.
Mixed sources are obvious within seconds: different stroke weights, different corners, colours that almost match but do not. At Q8DM the rules live on one page: the right examples, the wrong ones, and the exact measurements. Write them down before the first screen ships.
Diagrams, large icons, and flat line drawings belong in SVG. The file stays small, holds up on any screen density, and can inherit colour from CSS. Photographic or highly detailed artwork is better as a compressed raster image. Either way, set fixed dimensions so the layout does not jump while the page loads, and keep hero-sized artwork below the fold out of the first paint.
An illustration that only works for the eye excludes part of your audience. Functional images need alt text describing the purpose, not the appearance. Purely decorative drawings should carry an empty alt attribute so screen readers skip them instead of announcing noise. Contrast matters too, because pale artwork on white disappears in daylight and on older panels.
Illustrations hurt when they compete with the task. A user paying an invoice or reading a report does not need a full-width scene before the content. They also hurt when they repeat the headline in a more confusing form, or when the characters look nothing like the people using the product. Test with real users and watch behaviour: did they reach the right button, did they understand the state? Taste is not a metric.
Q8DM has built corporate interfaces since 1998, and the pattern is consistent: the drawings that work are quiet, clear, and tied to one specific moment. If you want a review of your interface artwork or a visual system your team can reuse, start at q8dm.com.