I have this too. If I try to recall images of people close to me, I get an instinctive flash, which is like an outline. If I try to focus in on the detail, the image disappears. Happens in dreams to some extent too - I generally dream normally (?) but if I become lucid then everything I try to look at disintegrates. For the record, I'm a programmer who always wanted to do something artistic. Coming to the realization…
However, this doesn't disqualify you from the arts under any circumstances! You might never be a photorealistic painter, but you might be better at, say, photography, as it's more about elimination of elements, or certain types of illustration (or music but I assume by "artistic" you meant visual arts). And, as usual, it's mostly hard work and only like 10% talent...