Decals; you have barely any, then. No meaningful ones except for the cut & paste job on the missile banks. Vents are just black lines; you should have shading on the insides, and exhaust marks. Lighting is helping the FSO engine; for one thing, glow maps don't cast a diffuse light upon the hull - that's part of your shading effect. Also because you're using TS by the looks of it, and you either get facets or full goraud, and that leads to less reliable lighting than, say, a realistic (25 degree IMO) angle. Skull and crossbones doesn't have any meaning; the Loki got away with teeth because they were a) placed in a meaningful and historically symbolic position, b) they were subtle, and c) they didn't take a place (that could be interpreted as) preserved for the squad insignia.
For example, attached below is my Chnubis map (downsized in half for upload); I'm not 100% happy with this looking back at it. I'd say it was medium quality, with high being professional level work (like DamoclesX' stuff, for example)
If you don't like my opinion, then fine. But I'm not going to lower the standards I hold for myself for other people. If I think it's crap, I'll say it's crap. Because I've made these mistakes myself, and the only way I get better was (and continuing to) recognising them.