1) Use good photo editing software.
2) Know how to use the good photo editing software.
3) Use top of the line photo grade paper. I find that matte looks more professional but it really depends upon your taste.
4) Keep the print heads clean and aligned.
PS: If you think you are going to print a good clear picture of Ober think again. Noone has ever managed anything other than a blurry "running" shot of him. Thus even the best of printers, software, paper, and maintenance is of no practical use in such a special case.