♥♦♣♠ NOT A TEACHER ♥♦♣♠
The two prepositions seem to be interchangeable. The sense of the use of to me is that I will be the sole recipient of your description; for me could mean the same as to me, as well as conveying the idea of substitution - someone other than you might describe the picture to someone else, instead of you.
for me could mean the same as to me, as well as conveying the idea of substitution - someone other than you might describe the picture to someone else, instead of you.