Submitting work to an art gallery:
1. Visit galleries and get an idea of which galleries appeal to you. Some galleries focus on new and emerging artists or local artists. Other galleries focus on established artists nationally and locally. There are also galleries that focus on certain genres or demographics.
The best way to get to know local galleries is by participating in gallery strolls. This allows you to get to know the owners/curators, meet artists, and network.
2. Make sure the photographs of your work are high quality. It is best to have a low resolution photograph to email and then a high-resolution photograph to show the detail of your work, this may be requested after the initial submission.
3. Be sure to keep your resume/CV up to date and concise. Gallery owners/curators are similar to human resource departments, they do not have a lot of time to spend sifting through resumes and submissions. They skim quickly so you need to have your best work present.
4. Visit gallery websites and they often have details on how to submit your work or what type of work they are accepting.
5. Do not be discouraged if you do not hear back, keep searching for a gallery, keep working on your art, and network.
Here is an example of a gallery website with their requirements.
I wrote about this topic on my personal blog awhile back and thought it would be a good repeat.