Rainier, CL (Seattle, WA) v2 - Update #1
I like your map, but the lack of anything interesting upsets me. All I see is roads and highway. Another thing that disinterests me is the monotonous tone of color. If there were more contrast in the colors, it would stand out more.
Anyway I left some islands from the bay and i added it, also of some modifications and details:
If you want it to be closer to the level of detail that IV's and V's maps bring, have one of them for reference when you are working on your map. Some elements you want to include in your map are more variety in roads, alleyways and important buildings (former in light grey, latter in dark grey), and more ruggedness on the edges of the map.
I hope those tips help you improve your map.
Las Venturas Update 2
So, here is what I have for Las Venturas so far. I moved the airport more toward the bottom right corner of the city rather being in the center, and I also used less runways for it.
I would make the city limits grey, similar to what GTA V's last gen map did, and make the roads black. The countryside should never be the same color as the city, so in doing so, it will make the city more apparent.