"Love" as a present simple verb can refer to: I, you, we or they. So which one is it? It would be a lazy mistake to just use "love to sew" in regular English, so don't be afraid of adding the subject! Hearing the subject sounds normal to us, because the verb hardly ever gives us that information. :) Missing subjects *can* exist in colloquial English, but to be honest it's very rare. As an imperative, yes it's true there's no subject.

In some cases you can skip the verb, but unfortunately "love to see" is not a sentence on its own. If you are commanding an action from someone, you can skip the subject "you" and just start with the verb. For example, "sew the sweater," is a sentence, and the subject "you" is automatically assumed.

Hey Steve! Thank you for your answer, it's all what i want to know. I've understood.

Hello Elina I'm Steve in Australia. I'd like to answer your question. You may use "love to sew" when you have already started the sentence. For example: I love to ride my bike, love to sew, love hiking etc. etc. you need to start with whom you are writing about first. It is incorrect to start a sentence with "love to sew". I hope this helps. English is a strange language. If you want to know more just ask.