It's generally considered more difficult. It has the advantage of possibly feeling more immersive, but at the same time can feel more contrived if not done exceptionally well.
"Jane looked into the boys eyes with a smile." seems to flow to the reader. In our minds, we don't particularly read it as "PAST TENSE" as if this is all some recount of stuff that already happened. In our minds, it's an ongoing situation.
"Jane looks into the boys eyes with a smile." looks terribly contrived. It feels like somebody is shoving the fact that you are reading into your face. So for the present tense you need to work a bit harder. "Jane looks into the boys eyes with a smile, and..." -- when working with present tense, the reader feels like each sentence must serve some progressing purpose, else it feels contrived.
Again, though... If done well, present tense can make you feel immersed in the story. Similar to a story told in second-person, it feels like you are witnessing an ongoing event in-person, rather than seeing it as some kind of observer in third-.
making it past or present
present tense
writing
Usage of Past Tense or Present Tense is all depends on the topic.
present
It should be written in present tense.
The present progressive tense of write is:I am writing.You/We/They are writing.He/She/It is writing.
The present tense allows you to refer to things that are currently happening.
It is when a writer switches between tenses. For example, they might begin writing in the present tense but then they switch to writing in the past tense.
Your question is not clear. The tense for the word 'writing' ? The word writing, if it is a verb, is called the present participle. To be past or present it must be with a word like am/is/are or was/were. was writing - past continuous is writing = present continuous But writing can also be a noun and nouns don't show tenses: His writing is very good.
Inappropriate changes would be called "problems with tense." Appropriate use of tense in a literary work involves maintaining the tense throughout the work. If you are writing in the present...verbs are in present tense; if writing in past tense, verbs will be in past tense, etc for future tense.
Yes it is if you are reading a novel