Hi! Nice sentence — it sounds like a little poem.
Short answer: Yes, your sentence is okay. It’s poetic and works well. Here’s how it breaks down so you can understand why.
- Two parts: The long dash (—) links the two parts. The first part is 'A little twig on a branch' and the second part is 'that's me on my skinny legs!'. The dash shows the second part is explaining the first.
- 'A little twig on a branch' is a phrase that names something (it’s not a full sentence by itself).
- 'that's me on my skinny legs!' is a complete sentence. 'That's' is a short way to say 'that is.'
- 'on my skinny legs' is a little description (a prepositional phrase) that tells us how you imagine yourself — like a twig standing on skinny legs.
A few easy suggestions if you want little changes:
- Keep it as it is — it sounds poetic: 'A little twig on a branch — that's me on my skinny legs!'
- Use two sentences: 'I'm a little twig on a branch. That's me on my skinny legs!'
- Make it clearer: 'I'm a little twig on a branch, standing on my skinny legs.'
All of these are correct. The first one you wrote is perfectly fine for a poem or a playful line — nice work!
Want to try another sentence? I can help you check that too.