OK, getting rid of the menu entry.
Menu > QuickLauncher > Type imagem and select the app represented with a logo. > Hit TAB and choose Edit Application Entry > Options tab > uncheck "Show in Menu". You will have to do this for all instances of imagemagick with a logo, the other mentions are not .desktop files.
Making Ephoto default for the usual formats.
Menu > Settings > tab Apps > Default applications.
In the dialog left pane scroll ~3/4 down where you should see a list of file extensions starting with image/. Select the items (one by one) with at least gif,jpeg,png and then choose Ephoto in the right pane as assigned application and hit apply. Do so for every image format you want but make sure Ephoto can handle that format.
This should do the trick.
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