To sharpen it a bit but still have the mip mappping, try this in the sahder...

in the texture sampler, add this line "mipmaplodbias=-0.5;"..

sampler detailmap = sampler_state
{
Texture = <entSkin2>;
MinFilter = Linear;
MagFilter = Linear;
MipFilter = Linear;
AddressU = wrap; //you want it wrap because it will be scaled smaller
AddressV = wrap;
mipmaplodbias=-0.5; //add this line, can play with the number
};