I think it depends...if your'e going to submit 10 photo's for every 1 digital work then it's a bad idea that will probably cost you the interest of a lot of your watchers here your'e a good photographer but I'll admit that good photography is way more common than good space art around here and it's the latter I'm most interested in. Sometimes I've un-watched some artists simply because they seemed to have "converted" to a whole new subject, style or media that I didn't find interesting anymore, a lot of their other loyal watchers started dropping like flies too
But if you do about 50/50 of both, then I see no harm in that, most decent watchers even if they aren't keen on photography would be pateint tos it through a couple of them between each digital peice
I don't know your photography account, but I 'spose that if your style of photography has to do with your digital art, why not? Otherwise, you'll be dragging all the kinds of different people to your gallery, I personally, wouldn't like that.