Models created in MikuMikuDance may be possibly exported as static pictures (.bmp for example) right inside the program. You can download it for free on the developers website and you may also find it on Steam platform. So you can try it yourself.
Convert MikuMikuDance model to Standard Windows bitmap image.
We found one software available in the database for this conversion.
Microsoft Windows software - convert pmd to bmp on Windows
A free 3D animation program
Convert from pmd file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.