I've recently been composing more directly with MuseScore as opposed to on my guitar and memory via repetition. This, however, is more tricky rhythm-wise, perhaps since I've never been a score reader or writer. Transcribing an audibly simple rhythm, example of first 2 bars of a composition I wrote (that took just about forever) is hard. When doing something from scratch, it's worse as you could forget the rhythmic phrase you had in mind or not know how or if you should divide it into voices.
What would be a good way to practice notating rhythm? Usually, I don't hear subdivisions and just know what to play for how long, and I don't count. Trying to mouth it to an excessively low bpm sometimes works, but with the example I had to play around with durations until I hit it by chance; could've been 13:7 tuplets for all I knew..