how could I mention sequence of figures in a research paper?
The exact format should be determined by the publication in which you publish your work (assuming this is what you do). You should be able to write Figures 1-4 or alternatively Figures 1 to 4 (although the former is what I am used to seeing). If the format uses abbreviated forms then Figs 1-4 would be the format. There is no need to repeat the word figure before both numbers in a sequence.