Yes — this is mostly a depth-of-field issue, not an 8MP issue. In close-up photography, only a thin plane is in focus, so parts of the pepper that are farther away will blur.

What to try:

• Use a smaller aperture (higher f-number) to increase depth of field.
• Add more light or use a tripod, since stopping down means less light and longer shutter speeds.
• Be aware that very small apertures can introduce diffraction, which can reduce sharpness.

If you need the entire subject sharp, the usual solution is focus stacking: take multiple shots on a tripod, each focused at a slightly different distance, then combine them in software.

So the main limitation here is close-up optics and depth of field, not simply that your camera is only 8MP. A newer camera or macro lens can help in some situations, but even with better gear, close-up subjects often still require stopping down and/or focus stacking to get everything sharp.