*snicker * rofl *cough cough* well you have got to start somewhere lolz.
First of all try making them more in the shape of a gun instead of a square.
Second use a pixel by pixel technique instead of predefined tools (sqaures and lines) for realy small objects like that especialy if you are doing it in just paint
Third dont use standard Paint.exe colors they get old fast cause too many people use them. Instead make custom colors that will be more designated to your style.
Fourth try getting some real gun images and try and detail your image better by maybe putting the picture near the screen or memorizing the way it looks.
[Edit]
Fifth dont ever use geocities for file linking it doesnt work
