There are two places you have to edit:

1. edit the ServiceReferences.ClientConfig to accept a large buffer.

 <binding name="BasicHttpBinding_MosaicService" maxBufferSize="2147483647"
                    maxReceivedMessageSize="2147483647"> 

2. on the server in the web.config

 <system.serviceModel>

add a Httpbinding and name it

<bindings>
     <basicHttpBinding>
       <binding name="ServicesBinding" maxReceivedMessageSize="2000000" maxBufferSize="2000000">
         <readerQuotas maxArrayLength="2000000" maxStringContentLength="2000000"/>
    </binding>

which setts it to 2MB and  tell the service to use this binding

 <system.serviceModel>

    <services>

         <service behaviorConfiguration="TekPlayground.MosaicServiceBehavior"
    name="TekPlayground.MosaicService">
    <endpoint address="" binding="basicHttpBinding" bindingConfiguration="ServicesBinding" contract="TekPlayground.MosaicService" />
    <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
   </service>