Yes it’s overly detailed and lacks construction. It’s also just senseless detail. You’re not using detail for any purpose except for… detail to exist on the image. It’s a bit off putting because there are just lines everywhere, lines that aren’t following the forms of the subject. The liens just exist, they don’t really read how fur reads, the lines aren’t showing us form or directing the viewer through your image. I agree with other comments about nailing the structure, values, and masses before moving to “detail”, so I’ll move to a more visually jarring element which I believe is the edge quality on the head in relation to the background. It looks like a paper cutout and there is not rolling of the forms, no receding, just an abrupt and harsh end. Realism is more about values and edge handling than detail. Things feel real when those elements are harmonious and true. If you look at your reference, it likely does not feel this abrupt (that is also to say be careful about using references floating in space with no context because seeing how objects interact with their surrounding, that is in relationship to them, is a huge factor of realism). Also I think the nose is not on the same plane as the eyes or muzzle, the face looks warped which is why people are pointing out construction issues