Hi,
i had a look at your GWT and the standard sitemaps are working correctly having links indexed and no warnings, and this is mainly important.
The problem arises only with images that are poorly indexed. If you host has no blocks for images, the problem could reside directly in Google criteria, for example images not interesting to be indexed, images already indexed, missing alt or title attribute, etc
By the way a filter to exclude images from folder 'plugins' should be added, so to avoid warnings. If you need my onsite assist, contact me at
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sending an account.
Of course views and clicks from search results to your site are not related to images not indexing. Moreover keep in mind that sitemaps are helpful for indexing links on websites, but to see any changes in search results the process requires months and involves a lot of other factors such as page ranks, backlinks, number of visits, etc. Submitting a sitemap doesn't mean that in few days Google has changed results for your site or that Bing maps your site.
John