Here goes:
For ship NR.1: take of the bump effect from the aztecs, and in the future, try to draw aztecs by hand, don't use generic patterns, believe me, it's more rewarding that way. Also, I do not see any clear indication of a shieldgrid. The escape pods are not of a uniform size, they seem to the biggest on the saucer ventral, smallest on the dorsal saucer. Things that that ship is missing are as follows: thrusters, teleporter pads, some machinery (you really need to look at well made fan ships and cannon ships on this one), sensor grids.
For ship NR.2: take the shieldgrid opacity down to about 30-40%, add stuff that are missing from ship NR.1 (excluding the shieldgrid, since you obviously unaware, added them, they're the machinery on the saucer edges, but that doesn't mean that all ships should have it that way) and aztec her.