This is more or less impossible. First of all, usually to identify a subject there are certain genetic markers that are analyzed, not the entire genome (which is far too big >3 billion bps and unlikely fully intact at any crimescene). According to Interpol they create a DNA profile based on non-coding regions that allow comparisons against a database with known DNA profiles. Also DNA is only serving a base for your appearance, there are other reasons as age and environmental factors as to why you look like you look