"Well, is correct to preserve the vector resizable capabilities of an illustration, as it is saved in pdf, SVG, EPS & even the native Ai extension, but if you want to reopen it in a pixel program like Photoshop your best option is to create your actual size canvas, then copy your vector art to it and paste in photoshop as ""inteligent object, then adjust the final posiion and size, after that you migh raster that, so you've, decided how the image is set up for your purpose.
or either save your illustration to a bitmap image, but use a maximum resolution profile or rather to use 300 dpi (recomended for standard printing).
However its necessary to think about the convenience of getting to pixels or still working in vectors, maybe you only wanted to make a layout or a sample of your vector work, so your best option is to preserve your original vector file and export the sample in a medium resolution pixel image."
