"We need more hard proof to go on to convict the murder suspect of murder", said Detective Smith.

"Working from Bali is not all rosfun and games, you know", said the remote coworker while sipping a drink on the beach.

I've never heard the expression "not all roses" before.

"I can understand thatwhy she wants to bail out of this business relationship.

Her business partner did not pull his weight and letforced her do all the work.,"

For the last sentence in the quote, you have to place quotation marks and then a period.

"Did not" is often written/said as "didn't".

"Let" seems more passively allowing something to happen. "Forced" or "caused" seems more appropriate to me here.

"

"Ignoring copyrights and putting any pictures you find on Google on your website is an accident waiting to happen"," said the web designer to her client.

The comma goes first, and then the quotation marks.

"We need more hard proof to go on to convict the suspect of murder", said Detective Smith

Some would argue that the comma goes inside the quotes. Here is a quote from Grammarly:

"Commas and periods always go inside the quotation marks in American English; dashes, colons, and semicolons almost always go outside the quotation marks; question marks and exclamation marks sometimes go inside, sometimes stay outside."

So in that case the sentence would be:

"We need more hard proof to go on to convict the suspect of murder," said Detective Smith

Other than that, this sentence is just fine!