access image information via web service api

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I wonder how can I check the image metadata  via webservice api. What I need is to find out while syncing data if some image needs to be updated or not. 

 

When you POST image via api there is some xml returned eg

 

<?xml version="1.0" encoding="UTF-8"?>
<prestashop xmlns:xlink="http://www.w3.org/1999/xlink">
<image>
  <id><![CDATA[2232]]></id>
  <id_product><![CDATA[246]]></id_product>
  <position><![CDATA[13]]></position>
  <cover><![CDATA[0]]></cover>
  <legend><language id="7" xlink:href="***/api/languages/7"><![CDATA[]]></language></legend>
</image>
</prestashop>

But still there is not enough info... Also I was trying to compare sha1sum returned by HEAD request and it seems that the image is being modified after upload so for now I don't see possibility to compare if there is new image or not.

 

Maybe someone have some experiences in this area?