It can be seen in my new blog post. Please check it out and let me know what you think.
Regarding pure modelling advice and not the actual implementation with the engine, or anything to do with it, I think you’ll find more valuable help on a dedicated forums for 3D work. Whatever software your using will have a forum and tutorials to get you focused and a grip on the tool itself and once you think your ready to put work out there try a site like CG Society or the like.
the model looks good, but i think it has too many polygons and the textures are too simple imo
Too many polygons? Dude it’s a mail box. It has 15 faces.
Clearly has more then 15 faces… this might not be a dedicated art forum but a lot of people working with Unity have some basic understanding of modelling just through the trials and errors they might have faced when attempting to get their pipeline in order. You should take the feedback, that you requested, and consider it.
Ok, I’m open to feedback, but I genuinely don’t understand how it has too many polygons.
You know, it helps to explain your reasoning when you critique someone’s work.
I think the biggest problem with being able to give valuable critique at this point would be that how someone assumes the piece will be used compared to how you might of originally thought the piece would be used could be way off from one another. If the object is going to be used for a game which would only display it in a way where it would only need like 10 tri’s then what you’ve provided would seem to much where on the other hand if its a vital piece of the game and needs that level of detail then it might be perfect, disregarding the low quality of texture detail.
Its hard to critique a piece without knowing its intended goal but if its simply made for practice then take what you can get and see if you can improve on it.
Why not post it here: http://blenderartists.org/forum/
You will probably get more feedback and secondly you will get to see what others work on and learn by communicating with people who are in the same boat like you. I/we know you want to model for games or even want to make your own game but before you can run you will have to learn how to walk 
Thomas
I second that motion, you will get a TON more support for you models and how to get better. We are more directed towards… Unity Integration or the other way around.
The first thing I noticed was that you reused the same texture multiple times on the UV map, where you could easily just overlap the polygons and increase the resolution of that texture; also, the map could definitely be packed in more tightly.