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Are you shooting for fine detail or just getting them online quick? A flatbed scanner works best if you have access to one - aim for at least 300 dpi and scan in grayscale or color depending on your drawings. If a scanner's not available, photograph them in natural daylight with your phone camera positioned straight-on, then crop and adjust contrast in any basic photo app. Either way, test a couple of pieces first so you know what settings work before scanning your whole portfolio.
The scanner route definitely gives you the cleanest results, but if you're dealing with large originals or don't have access to a good scanner, smartphone cameras have gotten pretty reliable - just make sure you're shooting in good natural light, keep the phone parallel to the paper, and use an app that automatically corrects perspective and crops. One thing people often skip: after scanning, spend a few minutes adjusting levels and contrast in something basic like Photoshop or even free tools, since pencil drawings can look flat straight off the scanner and a small tweak makes them pop way more for portfolio viewing.
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